Adds type hints with `CrawlerBase` for the table crawlers where required #2819

[pritishpai]

## Changes Adds type hints with CrawlerBase for the table crawlers where required #2819

Linked issues

(https://github.com/databrickslabs/ucx/pull/2813/files#r1786418356)

[github-actions[bot]]

✅ 43/43 passed, 3 skipped, 2h22m32s total

_{Running from acceptance #6513}

[JCZuurmond]

why do we need this?

I request Pritish to solve the missing type hint for the table crawlers, what you suggested in a comment is a good approach

[pritishpai]

Used superclass CrawlerBase for type hints. Had to add a placeholder method 'load_one' for one of the usages of TableCrawler