feat: Serializing impersonate enums uses legacy naming conventions

[0x676e67]

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[0x676e67]

This pull request includes significant updates to the Impersonate and ImpersonateOS enums in src/imp/mod.rs, adding detailed documentation and serialization support. Additionally, new tests have been added to ensure the correct serialization and deserialization of these enums.

Enhancements to enums:

• src/imp/mod.rs: Added comprehensive documentation for the Impersonate enum, detailing the naming conventions and providing examples. The enum now includes multiple browser versions for Chrome, Safari, OkHttp, Edge, and Firefox.
• src/imp/mod.rs: Introduced the ImpersonateOS enum with documentation, specifying naming conventions and examples. The enum covers various operating systems including Windows, MacOS, Linux, Android, and iOS.

Testing improvements:

• src/imp/mod.rs: Added a new module with tests for Impersonate and ImpersonateOS enums to verify their serialization and deserialization using serde_json.