Add better partition string escaping

[gallamine]

Based on the #179 this PR adds string escaping to non-integer partition values. Partitions like:

forecasted_business_day=2021-05-27

will now be wrapped like

forecasted_business_day="2021-05-27"

when executing the SQL

[codecov-commenter]

Codecov Report

Merging #180 (cdc603e) into main (bbfee5f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #180   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        57           
  Lines         2209      2210    +1     
  Branches       303       303           
=========================================
+ Hits          2209      2210    +1     

Impacted Files	Coverage Δ
dask_sql/input_utils/hive.py	100.00% <100.00%> (ø)

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[nils-braun]

Thank you so much @gallamine! I have added some thoughts to gallamine#1 on that and #181. I think we need to solve both issues at the same time.

[GPUtester]

Can one of the admins verify this patch?

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