feat: Emitter storage_type and mem_buf_limit config

[chrono2002]

What this PR does / why we need it:

Adds an ability to specify emitter storage type (fs or memory) and emitter buffer size.

Which issue(s) this PR fixes:

Fixes fluent/fluent-bit#4940

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.:

filters:

• rewriteTag:
  emitterName: rewrite_em
  emitterStorageType: filesystem
  emitterMemBufLimit: 128MB

• multiline:
  emitterName: multiline_em
  emitterStorageType: filesystem
  emitterMemBufLimit: 128MB
  keyContent: log
  parser: python

[benjaminhuo]

@chrono2002 You'll need to sign your commit by

git commit -s --amend
git push -f

[chrono2002]

@chrono2002 You'll need to sign your commit by

git commit -s --amend
git push -f

done

[benjaminhuo]

@chrono2002 Thank you!

[antrema]

@chrono2002 you didn't use the make manifests to generate the CRDs, so your modifications will be deleted each time the make manifests command will be played