Add Example Docs for `run_raw_sql`

[pankajastro]

Add documentation example for run_raw_sql operator/decorator with and without handler argument.

closes: #589 related: #584

[codecov[bot]]

Codecov Report

Merging #608 (fd314ec) into main (c283693) will increase coverage by 0.08%. The diff coverage is n/a.

:exclamation: Current head fd314ec differs from pull request most recent head a98f822. Consider uploading reports for the commit a98f822 to get more accurate results

@@            Coverage Diff             @@
##             main     #608      +/-   ##
==========================================
+ Coverage   92.68%   92.76%   +0.08%     
==========================================
  Files          41       42       +1     
  Lines        1681     1701      +20     
  Branches      214      216       +2     
==========================================
+ Hits         1558     1578      +20     
  Misses         97       97              
  Partials       26       26              

Impacted Files	Coverage Δ
src/astro/databases/base.py	96.07% <0.00%> (-0.06%)	:arrow_down:
src/astro/exceptions.py	100.00% <0.00%> (ø)
src/astro/files/__init__.py	100.00% <0.00%> (ø)
src/astro/files/operators/files.py	100.00% <0.00%> (ø)
src/astro/databases/snowflake.py	96.89% <0.00%> (+0.01%)	:arrow_up:
src/astro/databases/google/bigquery.py	97.41% <0.00%> (+0.01%)	:arrow_up:

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[utkarsharma2]

@pankajastro can you please add a proper description in the PR?

[kaxil]

@utkarsharma2 Can you review this PR again please

[utkarsharma2]

@pankajastro LGTM. Added minor comments, please resolve them before merging.