Add new properties for resource request

[eduardomourar]

Issue #, if available:

Description of changes:

Additional properties to BaseResourceHandlerRequest class:

• desiredResourceTags
• previousResourceTags
• systemTags
• awsAccountId
• region
• awsPartition

[codecov]

Codecov Report

Merging #23 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   97.49%   97.50%   +0.01%     
==========================================
  Files          13       13              
  Lines         877      881       +4     
  Branches      154      157       +3     
==========================================
+ Hits          855      859       +4     
  Misses         22       22              

Flag	Coverage Δ
#unittests	97.50% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/proxy.ts	95.74% <ø> (-0.75%)	⬇️
src/resource.ts	94.59% <ø> (ø)
src/interface.ts	100.00% <100.00%> (ø)

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