feat(endpoints): add domain-expiration-only-check

[qianlongzt]

Summary

1. fix Run Domain Expiration checks on the root domain #1159

2. Refactor Type for simplification and better performance
3. add missing endpoint type test for grpc feat(client): Add support for monitoring gRPC endpoints #1376

test result for perfomance

cpu: AMD Ryzen 7 4800H with Radeon Graphics
BenchmarkEndpoint_Type-16

Cut + switch 5053628 238.7 ns/op 0 B/op 0 allocs/op
Cut + map 2714998 438.6 ns/op 0 B/op 0 allocs/op
switch HasPerfix 2683519 430.9 ns/op 0 B/op 0 allocs/op

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Updated documentation in README.md, if applicable.

[qianlongzt]

@TwiN Is there anything I can do to help merge PR? Is there no progress?

[qianlongzt]

@PythonGermany Your PR qianlongzt#1 looks good to me, but what should I do next?

1. Merge your PR first and then wait for @TwiN to review?
2. Or should I not merge it, and instead have you submit your PR to @TwiN after my PR is merged?

[PythonGermany]

@qianlongzt Just merge my changes into your branch.

[PythonGermany]

I noticed my previous refactoring introduces one unintended (and maybe unwanted change). The startTime is now set before starting to build the http request.

To restore the original behavior we should update the startTime after building the request:

Suggested change

	request = e.buildHTTPRequest()
	request = e.buildHTTPRequest()
	startTime = time.Now()