Use zstd with compression 15 by default

[ivorbosloper]

closes #12

[Copilot]

Pull request overview

This PR changes the default compression algorithm for GeoParquet files from Brotli to zstd with a compression level of 15, aligning with the latest recommendations from the GeoParquet community for geospatial data compression. The change affects both the default behavior and adds a new CLI option to allow users to customize the compression level.

Changes:

• Default compression changed from "brotli" to "zstd" for GeoParquet files
• Added compression_level parameter throughout the conversion pipeline with default of 15 for zstd
• Added --compression_level CLI option to the convert command

Reviewed changes

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

Show a summary per file

File	Description
vecorel_cli/encoding/geoparquet.py	Updated write method to use "zstd" as default compression and automatically set compression_level to 15 for zstd when not specified
vecorel_cli/cli/options.py	Added GEOPARQUET_COMPRESSION_LEVEL option and changed default compression to "zstd"
vecorel_cli/convert.py	Added GEOPARQUET_COMPRESSION_LEVEL to imports and CLI arguments
vecorel_cli/conversion/base.py	Added compression_level parameter to convert method and passed it through to GeoParquet.write()
CHANGELOG.md	Documented the compression changes in the Unreleased section

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