MDEV-31740: Refactor InnoDB statistics handling with new InnoDBStatsRunner class

[Thirunarayanan]

• The Jira issue number for this PR is: MDEV-31740

Description

This commit introduces a major refactoring of the InnoDB statistics handling code to improve maintainability and consistency. The main changes include:

Introduced InnoDBStatsRunner class to encapsulate
statistics operations

• Centralizes statistics-related functionality in a single class
• Provides cleaner API for table and index statistics operations
• Handles transaction management and error handling consistently

Replaced direct SQL execution with structured method calls

• Added TableStat and IndexStat structures for type safety
• Improved error handling and resource cleanup

Performance optimizations

• Reduced string allocations by avoiding SQL string building
• Minimized database roundtrips for statistics operations
• More efficient memory usage with proper cleanup

How can this PR be tested?

Basing the PR against the correct MariaDB version

• This is a new feature or a refactoring, and the PR is based against the main branch.
• This is a bug fix, and the PR is based against the earliest maintained branch in which the bug can be reproduced.

PR quality check

• I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
• For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.

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