chore: allow overriding the guest token pyjwt instance

[suddjian]

SUMMARY

At Preset, we use one set of config for the global JWT instance and want to use a different config for our guest token JWTs.

TESTING INSTRUCTIONS

Covered by unit tests.

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• 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

[lilykuang]

LGTM

[codecov]

Codecov Report

Merging #19293 (0e60959) into master (d771ddb) will increase coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head 0e60959 differs from pull request most recent head 8727271. Consider uploading reports for the commit 8727271 to get more accurate results

@@            Coverage Diff             @@
##           master   #19293      +/-   ##
==========================================
+ Coverage   66.59%   66.64%   +0.05%     
==========================================
  Files        1670     1670              
  Lines       64587    64588       +1     
  Branches     6505     6505              
==========================================
+ Hits        43009    43045      +36     
+ Misses      19895    19860      -35     
  Partials     1683     1683              

Flag	Coverage Δ
hive	52.60% <50.00%> (+<0.01%)	⬆️
mysql	81.62% <100.00%> (+<0.01%)	⬆️
postgres	81.67% <100.00%> (+<0.01%)	⬆️
presto	52.45% <50.00%> (?)
python	82.09% <100.00%> (+0.10%)	⬆️
sqlite	81.44% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
superset/security/manager.py	95.11% <100.00%> (+<0.01%)	⬆️
superset/models/core.py	89.04% <0.00%> (+0.23%)	⬆️
superset/connectors/sqla/models.py	89.64% <0.00%> (+1.02%)	⬆️
superset/db_engine_specs/presto.py	89.12% <0.00%> (+4.81%)	⬆️

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[sadpandajoe]

🏷️ preset:2022.11