feat(profiling): add Dataset and QueryBuilder for profile functions metrics

[viglia]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.28713% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 77.91%. Comparing base (6c42e94) to head (035e23e). Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #71342      +/-   ##
==========================================
- Coverage   77.92%   77.91%   -0.01%     
==========================================
  Files        6552     6554       +2     
  Lines      292066   292161      +95     
  Branches    50458    50473      +15     
==========================================
+ Hits       227582   227639      +57     
- Misses      58230    58262      +32     
- Partials     6254     6260       +6     

Files	Coverage Δ
src/sentry/search/events/builder/__init__.py	100.00% <100.00%> (ø)
src/sentry/search/events/builder/discover.py	92.90% <100.00%> (+0.03%)	:arrow_up:
src/sentry/search/events/builder/metrics.py	88.34% <100.00%> (+0.26%)	:arrow_up:
src/sentry/search/events/constants.py	100.00% <100.00%> (ø)
src/sentry/search/events/datasets/base.py	88.88% <100.00%> (ø)
...search/events/builder/profile_functions_metrics.py	81.81% <81.81%> (ø)
...earch/events/datasets/profile_functions_metrics.py	60.93% <60.93%> (ø)

... and 11 files with indirect coverage changes