WIP: Native document reference support!

[wovalle]

Closes #118

[codecov]

Codecov Report

Merging #238 (b6c88f7) into master (b66b24e) will decrease coverage by 0.20%.
The diff coverage is 94.20%.

@@            Coverage Diff             @@
##           master     #238      +/-   ##
==========================================
- Coverage   94.85%   94.64%   -0.21%     
==========================================
  Files          24       25       +1     
  Lines         583      691     +108     
  Branches       95      128      +33     
==========================================
+ Hits          553      654     +101     
- Misses         27       34       +7     
  Partials        3        3              

Impacted Files	Coverage Δ
src/types.ts	100.00% <ø> (ø)
src/Errors/index.ts	71.42% <66.66%> (-3.58%)	⬇️
src/TypeGuards.ts	92.85% <83.33%> (-7.15%)	⬇️
src/utils.ts	97.22% <92.85%> (-2.78%)	⬇️
src/BaseFirestoreRepository.ts	98.46% <93.33%> (-1.54%)	⬇️
src/AbstractFirestoreRepository.ts	91.34% <100.00%> (+0.72%)	⬆️
src/Batch/FirestoreBatchUnit.ts	88.13% <100.00%> (-1.87%)	⬇️
src/Decorators/DocumentReference.ts	100.00% <100.00%> (ø)
src/Decorators/index.ts	100.00% <100.00%> (ø)
src/MetadataStorage.ts	100.00% <100.00%> (ø)
... and 5 more

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