feat(workspace): support binary and BLOB data types in DML mutation engine and grid validator

[ZhuchkaTriplesix]

Motivation & Problem

In lib/core/database/table_mutation_engine.dart, there is no handling for binary data types (bytea, blob, binary, varbinary, bit, raw). When a user edits a binary cell in the Data Grid with a hex string (e.g. \xDEADBEEF, 0xDEADBEEF, DEADBEEF), the mutation engine formats it as a standard string literal '\xDEADBEEF', which causes syntax errors in MySQL (BLOB) and SQLite (BLOB) or typing mismatch in PostgreSQL.

Additionally, GridDataTypeValidator lacks validation for binary / hex formats.

Proposed Solution

1. In TableMutationEngine:
   • Add _isBinaryType(dataTypeName).
   • Format binary values according to SQL dialect:
     • PostgreSQL: E'\\x...' or '\\x...'::bytea
     • MySQL: X'...'
     • SQLite: X'...'
2. In GridDataTypeValidator:
   • Add validation for blob, binary, varbinary, and bytea checking for valid hexadecimal representations.
3. Add unit tests for binary formatting and validation across dialects.

Acceptance Criteria

• Hexadecimal cell edits on binary columns produce valid SQL literals across PostgreSQL, MySQL, and SQLite.
• GridDataTypeValidator validates hex strings for binary types and rejects malformed non-hex input.
• Unit tests pass.