feat: Introduce hub

[HazAT]

This should be ready to review, besides the Coverage (which is caused by integrations) this should work just fine.

[codecov-io]

Codecov Report

Merging #1364 into master will decrease coverage by 11.23%.
The diff coverage is 48.79%.

@@             Coverage Diff             @@
##           master    #1364       +/-   ##
===========================================
- Coverage   84.77%   73.53%   -11.24%     
===========================================
  Files          31       31               
  Lines         742      699       -43     
  Branches      110      104        -6     
===========================================
- Hits          629      514      -115     
- Misses        109      182       +73     
+ Partials        4        3        -1

Impacted Files	Coverage Δ
packages/core/src/base.ts	100% <ø> (+1.25%)	⬆️
packages/core/test/mocks/client.ts	91.66% <ø> (ø)	⬆️
packages/core/src/sdk.ts	93.75% <ø> (ø)	⬆️
packages/core/test/mocks/backend.ts	100% <ø> (ø)	⬆️
packages/minimal/test/mocks/client.ts	100% <100%> (ø)
packages/node/src/integrations/http.ts	54% <100%> (ø)	⬆️
packages/node/src/integrations/console.ts	91.66% <100%> (ø)	⬆️
packages/hub/src/index.ts	100% <100%> (ø)
packages/node/src/index.ts	100% <100%> (ø)	⬆️
packages/node/src/sdk.ts	87.5% <100%> (ø)	⬆️
... and 14 more

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