Support for custom actions

[haffi96]

Needed for the POC here piccolo-orm/piccolo_admin#244

[codecov-commenter]

Codecov Report

Merging #200 (d4f635e) into master (5c3569e) will decrease coverage by 0.35%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
- Coverage   92.47%   92.11%   -0.36%     
==========================================
  Files          32       32              
  Lines        1846     1864      +18     
==========================================
+ Hits         1707     1717      +10     
- Misses        139      147       +8     

Impacted Files	Coverage Δ
piccolo_api/fastapi/endpoints.py	92.80% <55.55%> (-5.55%)	⬇️

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[dantownsend]

If it's possible without too much hassle, it would be cool if we could move the actions code down to PiccoloCRUD, and expose it via FastAPIWrapper. It just means someone could potentially use this functionality in a standalone API.

[haffi96]

If it's possible without too much hassle, it would be cool if we could move the actions code down to PiccoloCRUD, and expose it via FastAPIWrapper. It just means someone could potentially use this functionality in a standalone API.

Sure. That sounds like a good idea. Btw ill definitely update the unit testing etc to ensure a passing CI. Just wanted to get to the point where we have the final ish design first