Move hook manager registration to API package

[Nevay]

Makes extension hook manager available via SPI even if SDK is not installed.

Not removing registration in SDK to not break API 1.1.0 w/ SDK >1.1.0.

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.79%. Comparing base (cd8c0e3) to head (ae7ec6c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1402      +/-   ##
============================================
- Coverage     73.85%   73.79%   -0.07%     
  Complexity     2672     2672              
============================================
  Files           386      386              
  Lines          7650     7650              
============================================
- Hits           5650     5645       -5     
- Misses         2000     2005       +5     

Flag	Coverage Δ
8.1	73.49% <ø> (-0.01%)	⬇️
8.2	73.73% <ø> (-0.08%)	⬇️
8.3	73.64% <ø> (-0.02%)	⬇️
8.4	73.67% <ø> (-0.04%)	⬇️

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see 6 files with indirect coverage changes

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