Add AccountTools for NATS account management

- Introduced a new AccountTools package to manage NATS account operations, including viewing account information, generating reports, creating backups, and inspecting TLS chains.
- Implemented a comprehensive input schema for each tool, allowing for detailed configuration options.
- Integrated AccountTools into NATSServerTools and registered it within the tool categories for streamlined access.
- Updated README.md to reflect new account operations features.

Author: sinadarbouy

README.md

@@ -34,6 +34,11 @@ The Model Context Protocol (MCP) is an open protocol that standardizes how appli
   - Publish messages to NATS subjects
   - Support for different message formats
   - Asynchronous message publishing
+- Account Operations
+  - View account information and metrics
+  - Generate account reports (connections and statistics)
+  - Create and restore account backups
+  - Inspect TLS chain for connected servers
 - Multi-Account Support
   - Handle multiple NATS accounts simultaneously
   - Secure credential management