feat: multiple data source

[buntarb]

Check List

• Tests has been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

[codecov]

Codecov Report

Base: 75.85% // Head: 60.79% // Decreases project coverage by -15.05% ⚠️

Coverage data is based on head (c95876b) compared to base (2269b2b).
Patch coverage: 86.13% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5326       +/-   ##
===========================================
- Coverage   75.85%   60.79%   -15.06%     
===========================================
  Files         275      140      -135     
  Lines       33305    11836    -21469     
  Branches     2859     2900       +41     
===========================================
- Hits        25263     7196    -18067     
+ Misses       7754     4352     -3402     
  Partials      288      288               

Flag	Coverage Δ
cube-backend	60.79% <86.13%> (+0.68%)	⬆️
cubesql	?

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

Impacted Files	Coverage Δ
packages/cubejs-server-core/src/core/DevServer.ts	8.23% <4.54%> (-0.07%)	⬇️
packages/cubejs-base-driver/src/BaseDriver.ts	27.16% <16.66%> (ø)
packages/cubejs-backend-shared/src/env.ts	67.80% <98.79%> (+37.15%)	⬆️
packages/cubejs-backend-shared/src/index.ts	100.00% <100.00%> (ø)
...ackages/cubejs-server-core/src/core/OptsHandler.ts	87.65% <100.00%> (+0.05%)	⬆️
packages/cubejs-server-core/src/core/server.ts	66.76% <100.00%> (+0.09%)	⬆️
rust/cubesql/cubesql/src/sql/session_manager.rs
rust/cubesql/cubesql/src/sql/postgres/shim.rs
rust/cubesql/cubesql/e2e/tests/postgres.rs
...esql/cubeclient/src/models/v1_cube_meta_segment.rs
... and 132 more

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