fix: alert/report created by filter inconsistency with table display

[diegomedina248]

SUMMARY

The Alert/Report list doesn't have a creator column, yet there's a "created by" filter for it.
This creates an inconsistency for the user, that has a filter that is not visually represented in the table.
Furthermore, the table has some inconsistencies in the display with other tables in the system around these fields, like the dashboard ones.

This PR solves both, by adding the created by field to the table & allow the user to sort by both created by and owners.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

Before:

Screen.Recording.2022-04-04.at.13.06.53.mov

After:

Screen.Recording.2022-04-04.at.13.03.03.mov

TESTING INSTRUCTIONS

1. Go to the reports view
2. Add one report with user A (current user) as owner
3. Add one report with user A & user B as owners

Ensure that the owner & created by fields display correctly.
Ensure that the owner & created by filters work by filtering by their respective fields accordingly.

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 #19518 (c1d2956) into master (2de5e6f) will decrease coverage by 0.01%.
The diff coverage is 6.66%.

❗ Current head c1d2956 differs from pull request most recent head 891dd22. Consider uploading reports for the commit 891dd22 to get more accurate results

@@            Coverage Diff             @@
##           master   #19518      +/-   ##
==========================================
- Coverage   66.66%   66.64%   -0.02%     
==========================================
  Files        1678     1680       +2     
  Lines       64261    64272      +11     
  Branches     6561     6562       +1     
==========================================
  Hits        42837    42837              
- Misses      19723    19733      +10     
- Partials     1701     1702       +1     

Flag	Coverage Δ
javascript	51.44% <6.66%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
.../legacy-plugin-chart-country-map/src/CountryMap.js	0.00% <ø> (ø)
...y-plugin-chart-country-map/src/ReactCountryMap.jsx	0.00% <0.00%> (ø)
...y-plugin-chart-sankey-loop/src/ReactSankeyLoop.jsx	0.00% <0.00%> (ø)
.../legacy-plugin-chart-sankey-loop/src/SankeyLoop.js	0.00% <ø> (ø)
...lugin-chart-echarts/src/BigNumber/BigNumberViz.tsx	0.00% <0.00%> (ø)
superset-frontend/src/SqlLab/actions/sqlLab.js	60.39% <0.00%> (-0.35%)	⬇️
superset/models/sql_lab.py	91.55% <ø> (ø)
superset/reports/api.py	89.84% <ø> (ø)
...perset-frontend/src/views/CRUD/alert/AlertList.tsx	66.32% <33.33%> (-1.39%)	⬇️

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