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.