Add to_docx to report and tweak report

[ahuang11]

Builds on #1470

1. Make report not get schema if provided schema
2. Do not create sql_metaset (which calls get_schema and get_metadata)
3. Add to_docx and docx download button (which uses a docx template)

[ahuang11]

Keying on user_content instead of a separate param

[codecov]

Codecov Report

❌ Patch coverage is 8.69565% with 84 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.11%. Comparing base (639f4de) to head (ad076a9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
lumen/ai/export.py	8.57%	64 Missing ⚠️
lumen/ai/report.py	5.26%	18 Missing ⚠️
lumen/ai/schemas.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1468      +/-   ##
==========================================
- Coverage   49.14%   48.11%   -1.04%     
==========================================
  Files         124      124              
  Lines       21388    21468      +80     
==========================================
- Hits        10511    10329     -182     
- Misses      10877    11139     +262     

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