[feat] using exporter-toolkit/web for web config

[SamYuan1990]

Let's use this PR to discuss how we integrate with exporter-toolkit/web.
From exporter-toolkit/web SDK, we need *web.FlagConfig structure ready before we start the server.
but the question here is how we make it in our configuration and code structure.
we now have config in yaml file and those flag reg in same pattern, if we fully moved to exporter-toolkit/web as one example impl in this PR shows.
We still need all config in one place, so that it will not impact main.go, but somehow breaks config.go in yaml and flag reg process.
The benefits here IMO, is that we can leave web config to upstream repo for feature supports and it seems for an exporter we don't need to support listen on multi socket, so... just a default port and default TLS config file will be good enough.

[SamYuan1990]

@sthaha and @vimalk78 may I have your feedback on this PR? I know there some test case need to be fix, but maybe we need to vote for using exporter-toolkit/web for web config or not and make a design for how integration it.

[sthaha]

@sthaha and @vimalk78 may I have your feedback on this PR? I know there some test case need to be fix, but maybe we need to vote for using exporter-toolkit/web for web config or not and make a design for how integration it.

I like the idea of embedding webconfig into the config. It is one less configuration to worry about. Let me play around it a bit and get back to you.

---

Just a nit: ... This PR will be a feat and not a chore https://gist.github.com/qoomon/5dfcdf8eec66a051ecd85625518cfd13#types

[codecov]

Codecov Report

Attention: Patch coverage is 94.59459% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.05%. Comparing base (7ed9575) to head (9c68f7f).
Report is 10 commits behind head on reboot.

Files with missing lines	Patch %	Lines
internal/server/server.go	90.90%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           reboot    #2165      +/-   ##
==========================================
+ Coverage   91.51%   92.05%   +0.53%     
==========================================
  Files          36       36              
  Lines        3490     3612     +122     
==========================================
+ Hits         3194     3325     +131     
+ Misses        229      224       -5     
+ Partials       67       63       -4     

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[SamYuan1990]

@sthaha and @vimalk78 may I have your feedback on this PR? I know there some test case need to be fix, but maybe we need to vote for using exporter-toolkit/web for web config or not and make a design for how integration it.

I like the idea of embedding webconfig into the config. It is one less configuration to worry about. Let me play around it a bit and get back to you.

Just a nit: ... This PR will be a feat and not a chore https://gist.github.com/qoomon/5dfcdf8eec66a051ecd85625518cfd13#types

I just make some update in code and fix with test cases.