Added fields option for AWS ECR

[shahariaazam]

• Added fields option for AWS ECR
• Re-factored field mapper for sources to reduce code duplication

[codecov]

Codecov Report

Merging #45 (17069c1) into master (d053544) will decrease coverage by 0.41%.
The diff coverage is 91.75%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
- Coverage   60.25%   59.84%   -0.41%     
==========================================
  Files          22       22              
  Lines        1331     1325       -6     
==========================================
- Hits          802      793       -9     
- Misses        477      479       +2     
- Partials       52       53       +1     

Files Changed	Coverage Δ
pkg/source/scanner/github_repo_scanner.go	83.09% <84.21%> (-5.06%)	⬇️
pkg/source/scanner/aws_ecr.go	82.53% <86.95%> (-2.19%)	⬇️
pkg/source/scanner/scanner.go	95.74% <94.11%> (-4.26%)	⬇️
pkg/source/scanner/aws_ec2.go	93.05% <100.00%> (+0.12%)	⬆️
pkg/source/source.go	62.66% <100.00%> (+0.50%)	⬆️

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

94.6% Coverage
0.0% Duplication