added new metrics for vcenter receiver VM performance related met… (open-telemetry#37489)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description
This PR adds the following VM performance metrics for vcenter.

1. `vcenter.vm.cpu.time`
2. `vcenter.vm.network.multicast.packet.rate`
3. `vcenter.vm.network.broadcast.packet.rate`

More information on these metrics can be found
[here](https://docs.vmware.com/en/vRealize-Operations/8.10/com.vmware.vcom.metrics.doc/GUID-41603CD6-453B-4E26-A237-34E733BAB00C.html).
and also succinctly described
[here](https://www.servicenow.com/docs/bundle/xanadu-it-operations-management/page/product/agent-client-collector/reference/vsphere-metrics.html)

<!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. -->
open-telemetry#37488 


<!--Describe what testing was performed and which tests were added.-->
#### Testing
The metrics were scraped from a test vCenter environment, and golden
test files were updated accordingly to reflect the addition of the
metric.


<!--Describe the documentation added.-->
#### Documentation
Documentation was updated according to the metadata.yaml
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Signed-off-by: Samiur Arif <[email protected]>

Author: samiura

.chloggen/add-more-vecenter-receiver-virtual-machine-preformace-metrics.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: vcenterreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Adds three more vCenter virtual machine performance metrics
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [37488]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

receiver/vcenterreceiver/documentation.md

@@ -820,6 +820,23 @@ Total memory  capacity of the host system.
 | ---- | ----------- | ---------- | ----------------------- | --------- |
 | MiBy | Sum | Double | Cumulative | false |
 
+### vcenter.vm.cpu.time
+
+CPU time spent in idle, ready or wait state.
+
+As measured over the most recent 20s interval.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| % | Gauge | Double |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| cpu_state | CPU time spent in idle, ready or idle state. | Str: ``idle``, ``ready``, ``wait`` |
+| object | The object on the virtual machine or host that is being reported on. | Any Str |
+
 ### vcenter.vm.memory.granted
 
 The amount of memory that is granted to a VM.
@@ -828,6 +845,40 @@ The amount of memory that is granted to a VM.
 | ---- | ----------- | ---------- | ----------------------- | --------- |
 | MiBy | Sum | Int | Cumulative | false |
 
+### vcenter.vm.network.broadcast.packet.rate
+
+The rate of broadcast packets transmitted or received by each vNIC (virtual network interface controller) on the virtual machine.
+
+As measured over the most recent 20s interval.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| {packets/s} | Gauge | Double |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| direction | The direction of network throughput. | Str: ``transmitted``, ``received`` |
+| object | The object on the virtual machine or host that is being reported on. | Any Str |
+
+### vcenter.vm.network.multicast.packet.rate
+
+The rate of multicast packets transmitted or received by each vNIC (virtual network interface controller) on the virtual machine.
+
+As measured over the most recent 20s interval.
+
+| Unit | Metric Type | Value Type |
+| ---- | ----------- | ---------- |
+| {packets/s} | Gauge | Double |
+
+#### Attributes
+
+| Name | Description | Values |
+| ---- | ----------- | ------ |
+| direction | The direction of network throughput. | Str: ``transmitted``, ``received`` |
+| object | The object on the virtual machine or host that is being reported on. | Any Str |
+
 ## Resource Attributes
 
 | Name | Description | Values | Enabled |