[Improve][Agent] Update the SQLServer Source

[dockerzhang]

Description

the latest Agent plugin factored, SQLServer Source needs to be updated, you can refer to the development guide and MongoDB Source.

Requirements:

1. Optimize the logic and performance
2. A set of UTs

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InLong Component

InLong Agent

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct