Add support for transactions - fixes #62

[SamVerschueren]

This PR adds support for transactions.

• Write transactions
• Read transactions

[codecov-io]

Codecov Report

Merging #64 into master will decrease coverage by 0.1%.
The diff coverage is 95.91%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
- Coverage   96.94%   96.84%   -0.11%     
==========================================
  Files          17       26       +9     
  Lines         425      538     +113     
  Branches       40       43       +3     
==========================================
+ Hits          412      521     +109     
  Misses          8        8              
- Partials        5        9       +4

Impacted Files	Coverage Δ
src/lib/methods/list-tables.ts	86.66% <100%> (+8.09%)	⬆️
.../lib/methods/transactions/utils/condition-check.ts	100% <100%> (ø)
src/lib/methods/query.ts	96% <100%> (+0.54%)	⬆️
src/lib/methods/delete-item.ts	100% <100%> (ø)	⬆️
src/lib/methods/transactions/transact-method.ts	100% <100%> (ø)
src/lib/methods/update-item.ts	100% <100%> (ø)	⬆️
src/lib/methods/method.ts	100% <100%> (ø)	⬆️
...rc/lib/methods/transactions/read/transact-query.ts	100% <100%> (ø)
src/lib/dynamodb.ts	100% <100%> (ø)	⬆️
src/lib/methods/scan.ts	94.73% <100%> (+0.98%)	⬆️
... and 18 more

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