Fix various bugs and allow api keyword

[ahsand97]

Cyright module — PR description

Summary

Adds Cython api keyword support in the parser and type system, and wires the Cython extension settings (cython.typeCheckingMode, cython.includePaths) into the language server.

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Commit

• bccdab3cf — Fix various bugs and allow api keyword

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Changes

1. Cython api keyword

• tokenizerTypes.ts — New KeywordType.Api, added to varModifiers and softKeywords so api is accepted where public is (e.g. cdef public api void foo()).
• tokenizer.ts — Map 'api' → KeywordType.Api.
• parseNodes.ts — Add CTypeNode.isApi(node) (same pattern as isPublic).
• types.ts — Add isApi?: boolean to CythonDetails; set it in cloneForCType from CTypeNode.isApi(node).
• typePrinter.ts — When printing types, add 'api' to the modifier list when details.isApi.
• completionProvider.ts — Add 'api' to the Cython keyword list for completions.

2. Cython configuration

• configOptions.ts — Support typeCheckingMode === 'cython' and use a Cython-specific diagnostic rule set (e.g. getCythonDiagnosticRuleSet()).
• server.ts — Read cython.typeCheckingMode and cython.includePaths from the cython config section; default typeCheckingMode to 'cython' when running as the Cython extension.

References

• Cython C API declarations: https://cython.readthedocs.io/en/latest/src/userguide/external_C_code.html#c-api-declarations