feat: several Table.sample improvements

[jcrist]

This PR:

• Implements sample for polars
• Moves the errors for risingwave/druid to be compile time rather than execution time
• Centralizes the implementation of compiling tablesamples, fixing a TODO in the compiler
• Compiles Table.sample to the backend's native TABLESAMPLE clause when possible for bigquery, postgres, mssql, oracle, and impala. This is much more efficient when using method="block" as it lets the backend avoid reading in whole blocks of data, dramatically reducing IO. This was the main goal of this PR.
• Adds a SQL snapshot test to ensure the native implementation is being used when possible, and expands our execution tests to ensure execution works for all cases.

[lostmygithubaccount]

how for Polars? my understanding is lazyframes still don't support .sample per pola-rs/polars#3933 (apologies if I'm missing this)

for posterity see #10207 (comment)