feat: add function length

[xdlbdy]

Signed-off-by: delu [email protected]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

[codecov]

Codecov Report

Merging #364 (6d7884e) into main (09f3748) will increase coverage by 0.02%.
The diff coverage is 61.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #364      +/-   ##
==========================================
+ Coverage   62.72%   62.74%   +0.02%     
==========================================
  Files         133      161      +28     
  Lines       12128    13434    +1306     
==========================================
+ Hits         7607     8429     +822     
- Misses       3977     4414     +437     
- Partials      544      591      +47     

Impacted Files	Coverage Δ
internal/controller/eventbus/block/block.go	56.09% <0.00%> (ø)
internal/controller/eventbus/server/instance.go	72.04% <ø> (ø)
internal/controller/trigger/storage/secret.go	48.48% <ø> (ø)
...nternal/controller/trigger/storage/subscription.go	54.71% <ø> (ø)
...ernal/controller/trigger/storage/trigger_worker.go	63.41% <ø> (ø)
...rnal/primitive/interceptor/errinterceptor/error.go	0.00% <0.00%> (ø)
.../primitive/interceptor/memberinterceptor/member.go	0.00% <0.00%> (ø)
internal/primitive/vanus/id.go	19.68% <0.00%> (-0.65%)	⬇️
internal/raft/log/wal.go	100.00% <ø> (ø)
internal/store/block/raft/appender.go	0.00% <0.00%> (ø)
... and 97 more

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[wenfengwang]

LGTM