Replace ANTLR parser with CongoCC - #958
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Move CEL grammar generation into cel-core using CongoCC and remove the generated-antlr module, shadow jar dependency, and ANTLR runtime wiring. The generated parser now builds internal AST nodes with typed CEL expression conversion hooks, keeping parser construction close to the grammar while preserving the existing parser API and source-location handling. This simplifies dependency management for downstream consumers, removes the relocated ANTLR artifact from the build graph, and makes future grammar changes easier to review in the core module.
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Move CEL grammar generation into cel-core using CongoCC and remove the generated-antlr module, shadow jar dependency, and ANTLR runtime wiring.
The generated parser now builds internal AST nodes with typed CEL expression conversion hooks, keeping parser construction close to the grammar while preserving the existing parser API and source-location handling.
This simplifies dependency management for downstream consumers, removes the relocated ANTLR artifact from the build graph, and makes future grammar changes easier to review in the core module.