fix: Add missing relationship and pkg external info for SBOMs

[viveksahu26]

Fixes: #3581

This PR adds the following changes:

• It adds up Relationship section in the SBOMs.
• It also includes externalRefs under the package information.

TODO: Testing need to be added.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.32%. Comparing base (cc0e642) to head (c11ffa5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3582   +/-   ##
=======================================
  Coverage   91.32%   91.32%           
=======================================
  Files         184      184           
  Lines       16143    16143           
=======================================
  Hits        14742    14742           
  Misses       1227     1227           
  Partials      174      174           

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[gmlewis]

Thank you, @viveksahu26!
I know this PR is still a draft, but I wanted to give some early feedback before you got too far in writing the new tests.

[gmlewis]

Thank you, @viveksahu26!
LGTM.
Merging.