Implement encoding_name() to get the encoding name

[abetomo]

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[Copilot]

Pull request overview

This PR introduces a Groonga-context-aware encoding lookup so Python str values can be encoded according to the current grn_ctx encoding when writing text into Groonga objects.

Changes:

• Add grnpy_ctx_get_encoding(grn_ctx*) C helper to expose GRN_CTX_GET_ENCODING(ctx) to Cython.
• Implement Context.encoding_name() in Cython to map Groonga grn_encoding values to Python codec names.
• Use context.encoding_name() when encoding str values in Object._set_value().

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
grnpy/object.pyx	Encodes str values using the context’s encoding name instead of the default str.encode() behavior.
grnpy/grnpy_ctx.h	Declares a new helper to retrieve the current grn_ctx encoding.
grnpy/grnpy_ctx.c	Implements the new helper via GRN_CTX_GET_ENCODING(ctx).
grnpy/context.pyx	Adds Context.encoding_name() to translate Groonga encodings into Python codec names.
grnpy/context.pxd	Exposes the new encoding_name() Cython method to other Cython modules.

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