Publish all .g4 files as a zip to maven

[ahkcs]

This PR adds a GitHub Actions workflow that automatically packages and publishes ANTLR grammar files (.g4) from the language-grammar/src/main/antlr4 directory(containing all the existing .g4 files from opensearch-sql and opensearch-spark repo to the Maven snapshot repository.

Implementation Details

The workflow:

Packages all ANTLR .g4 grammar files into a single ZIP file
Creates the necessary directory structure in the Maven repository
Publishes the ZIP to https://aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/opensearch-language-grammar
Generates appropriate Maven metadata including POM files and checksum files
Tags the published artifacts with the source commit ID for traceability

Purpose

This allows grammar files to be versioned and distributed separately from the main codebase, enabling:

Grammar reuse across different projects

Independent versioning of grammar definitions

Easier integration of our grammar definitions in third-party tools

Testing

The workflow was tested by manually triggering it and verifying the artifacts were correctly published to the Maven repository at the specified path.

[noCharger]

1. need rebase after async-query-core change merged
2. g4 file from opensearch-spark is the source of truth
3. let's refactor the .yml to offload common actions to build.gradle