fix(validations): do not require min and max size validation

[phoebeschmidt]

Relax migration tool validations for min/max size field validations. Now they are not required, but still nullable.

[codecov]

Codecov Report

Merging #151 into master will decrease coverage by 4.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   88.44%   84.38%   -4.07%     
==========================================
  Files          80       80              
  Lines        2060     2145      +85     
  Branches      229      242      +13     
==========================================
- Hits         1822     1810      -12     
- Misses        194      260      +66     
- Partials       44       75      +31

Impacted Files	Coverage Δ
...e-api/validator/schema/field-validations-schema.ts	100% <ø> (ø)	⬆️
.../lib/offline-api/validator/schema/fields-schema.ts	58.33% <0%> (-41.67%)	⬇️
src/lib/intent-validator/field-movement.ts	63.15% <0%> (-36.85%)	⬇️
src/lib/migration-chunks/validation/field.ts	67.36% <0%> (-31.09%)	⬇️
src/lib/intent/editorinterface-reset.ts	40% <0%> (-24.29%)	⬇️
src/lib/intent/editorinterface-copy.ts	45% <0%> (-21.67%)	⬇️
src/lib/offline-api/validator/errors.ts	74.19% <0%> (-18.12%)	⬇️
src/lib/migration-steps/action-creators.ts	90% <0%> (-10%)	⬇️
src/lib/intent/field-create.ts	91.66% <0%> (-8.34%)	⬇️
src/lib/intent/content-type-delete.ts	92.85% <0%> (-7.15%)	⬇️
... and 16 more

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[Khaledgarbaya]

Small change

[phoebeschmidt]

🎉 This PR is included in version 0.15.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀