feat: improve compatibility of create table between mariadb and mysql

[shyim]

No description provided.

[Copilot]

Pull request overview

This pull request improves the compatibility of CREATE TABLE statements between MariaDB and MySQL by refactoring the schema extraction and generation logic.

Changes:

• Replaced SHOW CREATE TABLE approach with direct INFORMATION_SCHEMA queries for building CREATE TABLE statements
• Added collation mapping to convert MySQL 8.0+ collations (utf8mb4_0900_*) to MariaDB-compatible equivalents (utf8mb4_unicode_ci, utf8mb4_bin)
• Implemented batch schema prefetching to improve performance and support parallel table dumps

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
internal/mysqldump/schema.go	New file containing schema structures, collation mapping, and SQL generation logic for CREATE TABLE statements
internal/mysqldump/schema_test.go	Comprehensive unit tests for schema parsing, collation mapping, and SQL generation
internal/mysqldump/mysql.go	Refactored to use schema-based approach, added prefetching, replaced old parsing methods with structured schema queries
internal/mysqldump/mysql_test.go	Updated tests to mock INFORMATION_SCHEMA queries instead of SHOW CREATE TABLE

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