Add log to metrics plugin

[Athishpranav2003]

What this PR does / why we need it:

Add LogToMetrics Filter plugin

Which issue(s) this PR fixes:

Fixes #1285

Does this PR introduced a user-facing change?

Nope

Add `LogToMetrics` Filter plugin to Fluentbit component 

Additional documentation, usage docs, etc.:

Updated in the codebase itself.

[Athishpranav2003]

@cosmo0920 the build is failing for some other reason. I have raised PR so that we can get started with the discussions. Meanwhile i will try to look at the build issue. Also running make is actually modifying some other files dont know why. Would need your help in this part.

Do we need to add tests for this plugin?

[Athishpranav2003]

@benjaminhuo Now the local build is working. I guess make is autoformatting the code and wantedly changing

        modified:   apis/fluentbit/v1alpha2/plugins/filter/zz_generated.deepcopy.go
	modified:   apis/fluentbit/v1alpha2/zz_generated.deepcopy.go
	modified:   go.mod
	modified:   go.sum

Not sure why. I removed those changes and then pushed it for now

[Athishpranav2003]

@benjaminhuo push to ghcr seems to fail (403 error code). I guess thats issue with some configuration in gcp i guess. Does this seem fine now?

[Athishpranav2003]

@cosmo0920 Could you check the PR? i have addressed your comments

[benjaminhuo]

Not sure why. I removed those changes and then pushed it for now

The auto-generated files shouldn't be removed.
You should run make manifests generate fmt vet docs-update or even make test docs-update and commit everything generated @Athishpranav2003

[Athishpranav2003]

Ok fine
Will do it and update

[Athishpranav2003]

@benjaminhuo Have added them too as well

[cosmo0920]

I put an approve and kicked CI tasks as well.

[Athishpranav2003]

@cosmo0920 seems like its passing the tests. Anything else i missed?

[Athishpranav2003]

@benjaminhuo addressed your comments. I wasnt sure about the convention part that you guys followed

[benjaminhuo]

@benjaminhuo addressed your comments. I wasnt sure about the convention part that you guys followed

Thanks for the contribution! @Athishpranav2003