[REFACTOR][RELAX] Rename Relax base type to AnyType

[tqchen]

This PR introduces Relax AnyType as the primary top/base type spelling, replacing the previous ObjectType naming for the type that represents any Relax value.

Changes:

• Add AnyType/AnyTypeNode with relax.AnyType registration and keep ObjectType/R.Object compatibility aliases.
• Update Relax type analysis, type visitors, opaque function defaults, and script printer/parser handling to use AnyType/R.Any.
• Migrate affected Python/C++ call sites, docs, and focused tests to the new spelling.

Validation:

• cmake --build build --parallel 16
• Focused Relax/TVMScript pytest: 704 passed, 1 xfailed
• pre_commit run --files

[gemini-code-assist]

Code Review

This pull request renames ObjectType and ObjectTypeNode to AnyType and AnyTypeNode within TVM's Relax compiler, and introduces R.Any in TVM Script to replace R.Object. It also adds compatibility aliases for both C++ and Python to ensure backward compatibility with existing codebases. These changes are consistently propagated across type definitions, parser/printer components, transformation passes, and a large suite of tests. There are no review comments provided, so I have no additional feedback to offer.

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