feat: allow uploads in crud view

[pkdotson]

SUMMARY

This pr creates an additional dropdown in the subnav for the upload in the database crud view.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Screen.Recording.2022-03-10.at.9.13.38.AM.mov

TESTING INSTRUCTIONS

Go to database crud view page and test upload a file dropdown.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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 #18953 (5f01fda) into master (8d53db1) will decrease coverage by 0.02%.
The diff coverage is 82.60%.

@@            Coverage Diff             @@
##           master   #18953      +/-   ##
==========================================
- Coverage   66.54%   66.52%   -0.03%     
==========================================
  Files        1646     1643       -3     
  Lines       63630    63589      -41     
  Branches     6475     6494      +19     
==========================================
- Hits        42343    42301      -42     
  Misses      19607    19607              
- Partials     1680     1681       +1     

Flag	Coverage Δ
javascript	51.33% <82.60%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset-frontend/src/views/components/Menu.tsx	58.97% <ø> (ø)
superset-frontend/src/views/components/SubMenu.tsx	87.50% <77.77%> (-1.87%)	⬇️
superset-frontend/src/views/CRUD/utils.tsx	65.57% <80.00%> (+0.61%)	⬆️
...tend/src/views/CRUD/data/database/DatabaseList.tsx	67.39% <87.50%> (+1.91%)	⬆️
...perset-frontend/src/views/components/MenuRight.tsx	67.69% <100.00%> (+1.97%)	⬆️
...d/src/SqlLab/components/QueryAutoRefresh/index.jsx	61.29% <0.00%> (-22.05%)	⬇️
...rontend/src/explore/components/EmbedCodeButton.jsx	55.00% <0.00%> (-11.67%)	⬇️
...RUD/data/database/DatabaseModal/SqlAlchemyForm.tsx	57.14% <0.00%> (-9.53%)	⬇️
...d/src/SqlLab/components/AceEditorWrapper/index.tsx	44.82% <0.00%> (-8.75%)	⬇️
...ontend/src/components/URLShortLinkButton/index.jsx	93.75% <0.00%> (-6.25%)	⬇️
... and 72 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8d53db1...5f01fda. Read the comment docs.

[yousoph]

/testenv up

[github-actions]

@yousoph Ephemeral environment spinning up at http://52.38.37.16:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[yousoph]

@pkdotson
Some notes / change requests:

1. Dropdown text is the wrong color - it should be the same as primary button for both default and hover states. (Caret color is correct though so that doesn't need to change)
2. The dropdown and the + Database button aren't vertically centered in the header bar. Same issue on the other CRUD pages
3. Dropdown menu should open on click rather than on hover
4. The down caret next to the "Upload file to database" text doesn't look vertically centered - it looks too low
5. Text updates : remove "a" before CSV and Columnar File
6. Casing update: Should be "Upload a columnar file"
7. There's something happening with the animation when the dropdown opens that makes it look like it's flashing a bit. There's a blue line that shows for a second
8. The dropdown alignment looks too high and too close to the text - check the Figma file for reference
   (Is there an existing dropdown component that we can be using here?)

[yousoph]

One more text change: should be "Upload Excel file"
Thanks!

[yousoph]

/testenv up

[github-actions]

@yousoph Ephemeral environment spinning up at http://34.218.239.39:8080. Credentials are admin/admin. Please allow several minutes for bootstrapping and startup.

[github-actions]

Ephemeral environment shutdown and build artifacts deleted.