Refactor Create Package

[azlam-abdulsalam]

Create Package has been untouched over a period and lot of cruft has set in. This is one of
the first many attempts, to clean the codebase

• Move files to package module
• refactor(create-package): refactor the create package stack

[codecov-commenter]

Codecov Report

Merging #746 (1028567) into develop (1aef0c8) will increase coverage by 0.21%.
The diff coverage is 68.29%.

❗ Current head 1028567 differs from pull request most recent head 687255d. Consider uploading reports for the commit 687255d to get more accurate results

@@             Coverage Diff             @@
##           develop     #746      +/-   ##
===========================================
+ Coverage    64.59%   64.81%   +0.21%     
===========================================
  Files           44       44              
  Lines         1466     1475       +9     
  Branches       264      268       +4     
===========================================
+ Hits           947      956       +9     
  Misses         519      519              

Impacted Files	Coverage Δ
.../core/src/sfdxwrappers/ConvertSourceToMDAPIImpl.ts	83.78% <ø> (ø)
packages/core/src/package/PackageManifest.ts	74.50% <66.66%> (+5.46%)	⬆️
packages/core/src/package/SFPPackage.ts	83.33% <100.00%> (ø)

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