feat: add .toBeJsonMatching(expectation) matcher

[Belema]

What

This adds support for a new custom matcher .toBeJsonMatching(...).

Why

This matcher is useful when one wants to check that a function has been called with a JSON string that satisfies some constraints,

expect(fn).toHaveBeenCalledWith(
  expect.toBeJsonMatching({ key1: 'value1' })
);

Housekeeping

• Unit tests
• Documentation is up to date
• No additional lint warnings
• Typescript definitions are added/updated where relevant

[SimenB]

@Belema I like this - could you resolve the conflicts?

[changeset-bot]

⚠️ No Changeset found

Latest commit: d2fdc8b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[Belema]

@Belema I like this - could you resolve the conflicts?

@SimenB, I have just rebased the changes.

[codecov]

Codecov Report

Merging #481 (d2fdc8b) into main (5b80ca8) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #481   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           73        74    +1     
  Lines          674       712   +38     
  Branches       290       304   +14     
=========================================
+ Hits           674       712   +38     

Impacted Files	Coverage Δ
src/matchers/toBeJsonMatching.js	100.00% <100.00%> (ø)
src/matchers/toPartiallyContain.js	100.00% <100.00%> (ø)
src/utils/index.js	100.00% <100.00%> (ø)

[SimenB]

Make sure to add a changeset so this triggers a release

[Belema]

Make sure to add a changeset so this triggers a release

@SimenB I have done so, and accidentally deleted my branch (which closed this PR). I have opened a new one #606 for it.