feat: extra table metadata for Google Sheets

[betodealmeida]

SUMMARY

This PR uses the new GET_METADATA function in shillelagh 0.7.0 to show extra metadata about spreadsheets in the metadata browser in SQL Lab, namely the Spreadsheet and Sheet (tab) titles.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

After:

TESTING INSTRUCTIONS

1. Add a Google Sheets database connection with credentials.
2. Go to SQL Lab, choose Google Sheets.
3. Choose the "main" schema.
4. The list of spreadsheets should show up as tables. Click one.
5. The metadata should show up correctly.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #14775 (a7d0c5a) into master (7f2f51b) will decrease coverage by 0.28%.
The diff coverage is 41.66%.

@@            Coverage Diff             @@
##           master   #14775      +/-   ##
==========================================
- Coverage   77.24%   76.96%   -0.29%     
==========================================
  Files         975      976       +1     
  Lines       50866    51238     +372     
  Branches     6740     6895     +155     
==========================================
+ Hits        39293    39433     +140     
- Misses      11357    11586     +229     
- Partials      216      219       +3     

Flag	Coverage Δ
hive	81.35% <35.29%> (-0.03%)	⬇️
javascript	71.52% <57.14%> (-0.34%)	⬇️
mysql	81.62% <35.29%> (-0.03%)	⬇️
postgres	81.64% <35.29%> (-0.03%)	⬇️
presto	?
python	82.01% <35.29%> (-0.18%)	⬇️
sqlite	81.25% <35.29%> (-0.04%)	⬇️

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Impacted Files	Coverage Δ
...et-frontend/src/SqlLab/reducers/getInitialState.js	50.00% <ø> (ø)
superset/db_engine_specs/gsheets.py	58.33% <35.29%> (-21.67%)	⬇️
...et-frontend/src/SqlLab/components/TableElement.tsx	88.75% <57.14%> (-3.25%)	⬇️
...c/views/CRUD/data/database/DatabaseModal/index.tsx	47.86% <0.00%> (-27.46%)	⬇️
...c/views/CRUD/data/database/DatabaseModal/styles.ts	86.11% <0.00%> (-11.15%)	⬇️
...RUD/data/database/DatabaseModal/SqlAlchemyForm.tsx	92.30% <0.00%> (-7.70%)	⬇️
superset/db_engine_specs/presto.py	84.42% <0.00%> (-5.90%)	⬇️
superset-frontend/src/views/CRUD/hooks.ts	48.23% <0.00%> (-4.58%)	⬇️
superset/db_engine_specs/bigquery.py	87.75% <0.00%> (-2.18%)	⬇️
superset/connectors/sqla/models.py	88.45% <0.00%> (-1.42%)	⬇️
... and 16 more

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