chore: add state comments

[GimmeCyy]

What this PR does:
add state anno #438

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@42bd651). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head 05eb1a6 differs from pull request most recent head c23c9ba. Consider uploading reports for the commit c23c9ba to get more accurate results

@@           Coverage Diff           @@
##             main     #487   +/-   ##
=======================================
  Coverage        ?   60.50%           
=======================================
  Files           ?      118           
  Lines           ?     6357           
  Branches        ?        0           
=======================================
  Hits            ?     3846           
  Misses          ?     2142           
  Partials        ?      369           

Impacted Files	Coverage Δ
pkg/grpc/dapr/dapr_api_state.go	21.84% <ø> (ø)
pkg/grpc/default_api/api_state.go	86.48% <ø> (ø)
pkg/runtime/state/compatibility.go	100.00% <ø> (ø)
pkg/runtime/state/factory.go	100.00% <ø> (ø)
pkg/runtime/state/registry.go	100.00% <ø> (ø)

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[seeflood]

lgtm

[seeflood]

Thanks for your contribution and welcome to the community !