Handle Long Identifiers for Babelfish

[anju15bharti]

Description

Engine-side changes to support long identifier handling in Babelfish.

1. New hooks (bbf_get_original_constraint_name_hook, bbf_get_original_index_name_hook) allow the extension to resolve original constraint/index names in unique violation and check constraint error messages.

2. tle_name_comparison_hook extended with sourcetext and locationparameters so ORDER BY clauses can match long column aliases by extracting the full identifier from the raw query text.

3. View column truncation — When sql_dialect == SQL_DIALECT_TSQL and a view column name exceeds NAMEDATALEN, it is MD5-truncated before storage in pg_attribute.

4. Rule rewrite tolerance — checkRuleResultList in rewriteDefine.c now allows a long SELECT column name to match its truncated attname counterpart for TSQL views.

5. Dump support — babelfish_identifier_mapping added to logical and physical dump paths.

6. Syscache — IDENTMAPPINGNAME registered for the new identifier mapping catalog

Extension PR : babelfish-for-postgresql/babelfish_extensions#4866

Issues Resolved

BABEL-2564, BABEL-5975, BABEL-5321, BABEL-2650, BABEL-6817, BABEL-1518, BABEL-5207, BABEL-5650, BABEL-5416, BABEL-1519

Check List

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[anju15bharti]

/code-review