feat: adding abstract type

[anandtiwary]

Description

Please include a summary of the change, motivation and context.
Adding abstract type to ModelInject

Testing

Please describe the tests that you ran to verify your changes. Please summarize what did you test and what needs to be tested e.g. deployed and tested helm chart locally.

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

Documentation

Make sure that you have documented corresponding changes in this repository or hypertrace docs repo if required.

[codecov]

Codecov Report

Merging #102 (7ce37db) into main (2f51d49) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #102   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines          650       651    +1     
  Branches        61        61           
=========================================
+ Hits           650       651    +1     

Impacted Files	Coverage Δ
...gular/src/model/decorators/model-inject.service.ts	100.00% <100.00%> (ø)

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[hypertrace-ci]

🎉 This PR is included in version 2.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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