feat: move utils to internal

[meguminnnnnnnnn]

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[github-actions]

⚠️ Breaking API Changes Detected

This pull request contains breaking API changes that may affect compatibility:

uncompatible api changes found: 
github.com/cloudwego/eino/utils/safe
  Incompatible changes:
  - NewPanicErr: removed

github.com/cloudwego/eino/utils/generic
  Incompatible changes:
  - NewInstance: removed
  - Pair: removed
  - ParseTypeName: removed
  - PtrOf: removed
  - Reverse: removed
  - TypeOf: removed

Required Actions:

1. Please review these changes carefully
2. Update the user documentation to reflect these API changes
3. Add a note in the changelog about these breaking changes

[github-actions]

license-eye has totally checked 159 files.

Valid	Invalid	Ignored	Fixed
158	1	0	0

Click to see the invalid file list

• internal/safe/panic_test.go

[github-actions]

📊 Coverage Report:

File coverage threshold (20%) satisfied:	PASS
Package coverage threshold (30%) satisfied:	PASS
Total coverage threshold (83%) satisfied:	PASS
Total test coverage: 83.5% (3308/3960)