fix(growthbook): types

[philibea]

• Migrate from null to void for return function type
• Add the possibility to configure loadFeature

[changeset-bot]

🦋 Changeset detected

Latest commit: 7664c0f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@scaleway/use-growthbook	Patch

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[codecov]

Codecov Report

Merging #1439 (7664c0f) into main (5cf067c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1439   +/-   ##
=======================================
  Coverage   98.69%   98.69%           
=======================================
  Files          26       26           
  Lines         688      689    +1     
  Branches       97       97           
=======================================
+ Hits          679      680    +1     
  Misses          1        1           
  Partials        8        8           

Files Changed	Coverage Δ
packages/use-growthbook/src/useAbTestAttributes.ts	100.00% <ø> (ø)
packages/use-growthbook/src/AbTestProvider.tsx	100.00% <100.00%> (ø)