feat: add Apache Doris parser to monorepo

Add ANTLR4-based Apache Doris SQL parser from doris-parser repository into the parser monorepo.

Changes:
- Add doris/ directory with grammar files (DorisSQL.g4, DorisSQLLex.g4)
- Add Makefile with build and test targets following the pattern of other parsers
- Include test example for Doris SQL syntax
- Update package name and import paths to github.com/bytebase/parser/doris
- Add doris to CI workflow to run tests automatically
- All test cases passing

Test coverage:
- Doris SQL syntax and features
- DDL and DML statements
- Doris-specific extensions

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: h3n4l

.github/workflows/tests.yml

@@ -34,7 +34,7 @@ jobs:
         id: set-matrix
         run: |
           # List of all available parsers
-          ALL_PARSERS="redshift postgresql cql snowflake tsql"
+          ALL_PARSERS="redshift postgresql cql snowflake tsql doris"
           # Add more parsers here as they are added to the repository
           # ALL_PARSERS="redshift mysql postgresql"