feat(sql): add jinja support to metrics and expressions

[villebro]

SUMMARY

This adds support for Jinja templating to calculated columns and SQL metrics. The PR also adds TypedDict types for adhoc metrics to improve code quality and linting.

BEFORE

Before Jinja was not processed in calculated columns nor SQL metrics

AFTER

Now Jinja in both calculated columns and SQL metrics are processed correctly:

TESTING INSTRUCTIONS

1. Create a new chart
2. Add a SQL metric with Jinja
3. Add a calculated column to the dataset with Jinja
4. Press "Run"
5. See query execute successfully and notice that Jinja syntax in metric and and calculated column are rendered.

ADDITIONAL INFORMATION

• Has associated issue:
• 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 #15247 (68c75ed) into master (c7c6375) will decrease coverage by 0.22%.
The diff coverage is 100.00%.

❗ Current head 68c75ed differs from pull request most recent head 164785f. Consider uploading reports for the commit 164785f to get more accurate results

@@            Coverage Diff             @@
##           master   #15247      +/-   ##
==========================================
- Coverage   77.25%   77.03%   -0.23%     
==========================================
  Files         971      971              
  Lines       50308    50322      +14     
  Branches     6140     6140              
==========================================
- Hits        38867    38765     -102     
- Misses      11237    11353     +116     
  Partials      204      204              

Flag	Coverage Δ
hive	?
mysql	81.71% <100.00%> (+<0.01%)	⬆️
postgres	81.72% <100.00%> (+<0.01%)	⬆️
presto	?
python	81.81% <100.00%> (-0.44%)	⬇️
sqlite	81.35% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/common/query_object.py	90.14% <100.00%> (ø)
superset/connectors/druid/models.py	82.79% <100.00%> (ø)
superset/connectors/sqla/models.py	88.22% <100.00%> (-1.59%)	⬇️
superset/typing.py	100.00% <100.00%> (ø)
superset/utils/core.py	88.93% <100.00%> (-0.13%)	⬇️
superset/viz.py	56.35% <100.00%> (ø)
superset/db_engines/hive.py	0.00% <0.00%> (-82.15%)	⬇️
superset/db_engine_specs/hive.py	69.20% <0.00%> (-17.21%)	⬇️
superset/db_engine_specs/presto.py	83.36% <0.00%> (-6.53%)	⬇️
superset/views/database/mixins.py	81.03% <0.00%> (-1.73%)	⬇️
... and 4 more

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[villebro]

This cast is necessary, as it's not possible to do proper union types where column_name is always defined if expression_type == 'SIMPLE' but None if expression_type == 'SQL'

[suddjian]

LGTM

[betodealmeida]

Awesome!