feat: Added MetaString Class for Unicode Encoding/Decoding in Type.Object Code Generation

[Forchapeatl]

What does this PR do?

The MetaString class is introduced to handle Unicode encoding and decoding for strings used in the code generation process for Type.Object. This ensures that strings are properly encoded and decoded during storage and transmission.

• Encoding: Converts Unicode strings into an encoded format.
• Decoding: Converts encoded strings back to their original Unicode format.

The MetaString class is used in object.ts to handle string encoding and decoding when generating code for Type.Object.

Related issues

Is there any related issue? Please attach here.

• [JavaScript] Type Forward/Backward compatible object serialization for Fury JavaScript  #1670
• [JavaScript] Implement the object metadata compression protocol #1671
• [JavaScript] Support encoding field names with varint in type metadata #1674

Does this PR introduce any user-facing change?

• Does this PR introduce any public API change?
• Does this PR introduce any binary protocol compatibility change?

@theweipeng Please have a look at my PR

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