Add JSON marshalling and unmarshalling

[AlekSi]

Closes #49.
Closes #70.

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (5)

wirebson/bson_test.go:370

• The JSON key is empty. JSON keys should be meaningful and not empty to avoid confusion and potential issues.

"": "foo",

wirebson/bson_test.go:796

• The JSON key is empty. JSON keys should be meaningful and not empty to avoid confusion and potential issues.

"": false,

wirebson/array.go:184

• The new method MarshalJSON should be covered by tests to ensure its functionality.

func (arr *Array) MarshalJSON() ([]byte, error) {

wirebson/array.go:209

• The new method UnmarshalJSON should be covered by tests to ensure its functionality.

func (arr *Array) UnmarshalJSON(b []byte) error {

wirebson/binary.go:91

• The removal of the conditional check before making a slice and copying bytes might introduce unintended behavior if 'i' is zero. Consider restoring the check.

res.B = make([]byte, i)

[codecov]

Codecov Report

Attention: Patch coverage is 29.03226% with 44 lines in your changes missing coverage. Please review.

Project coverage is 62.93%. Comparing base (f782d49) to head (899bdb3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
wirebson/array.go	0.00%	30 Missing ⚠️
wirebson/document.go	53.33%	10 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   63.88%   62.93%   -0.95%     
==========================================
  Files          41       41              
  Lines        2337     2396      +59     
==========================================
+ Hits         1493     1508      +15     
- Misses        662      702      +40     
- Partials      182      186       +4     

Files with missing lines	Coverage Δ
wirebson/binary.go	75.00% <100.00%> (-1.00%)	⬇️
wirebson/document.go	46.25% <53.33%> (+1.63%)	⬆️
wirebson/array.go	47.05% <0.00%> (-15.87%)	⬇️

Flag	Coverage Δ
test	62.93% <29.03%> (-0.95%)	⬇️

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