feat: use well-defined dimensions instead of strings

[cosmic-chichu]

Using dimensions as a list of strings causes ambiguity in other druid clients. Well-defined dimensions makes use of the utility in pydruid to create dimensions as DimensionSpec. This helps with deterministic serialization and de-serialization of the query.

[codecov]

Codecov Report

Merging #283 (f91ea65) into main (de8930a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head f91ea65 differs from pull request most recent head 0c674f8. Consider uploading reports for the commit 0c674f8 to get more accurate results

@@           Coverage Diff           @@
##             main     #283   +/-   ##
=======================================
  Coverage   93.29%   93.30%           
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  Files          66       66           
  Lines        2909     2913    +4     
  Branches      233      234    +1     
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+ Hits         2714     2718    +4     
  Misses        156      156           
  Partials       39       39           

Files Changed	Coverage Δ
numalogic/connectors/druid.py	87.80% <100.00%> (+1.31%)	⬆️

... and 1 file with indirect coverage changes

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