replace msgpack library

[nicolasparada]

Replace msgpack library from github.com/ugorji/go/codec to github.com/vmihailenco/msgpack/v5.

There are still references to the old library in the subppackages that I didn't want to touch yet.

It has better support for (un)marshalling types like time.Time making tests more expectables.

Also included tests from ##68 and msgpack unmarshalling into map[string]any instead of map[string]string.

Also did some chores and updated some dependencies, addressed some lint issues, etc.

[nicolasparada]

Notice that CI is failing, but it was failing from before. There are too many lint problems (maybe the linter is too strict considering we are using many C idioms).

[cosmo0920]

I confirmed that this change should not affect hot-reloading. And working as intended. But I'm still processing for how this replacement works.

[cosmo0920]

All confirmed for time related things. Looks attractive. 👍

[cosmo0920]

Oh, I've overlooked for the requirements of this replacement. We need to handle timestamp related things to ordinary msgpack objects when it printed or ingested in the ordinary records.

[nicolasparada]

Right. This does not fixes the issue that fluent-bit still renders Go's time.Time type as bytes.

[jasmingacic]

If I'm reading this correctly this is mostly refactoring to replace the library.
If that's the case it looks good to me