imp: relayer builder simplified and accepts multiples of the same module

[srdtrk]

Description

closes: #XXXX

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Before we can merge this PR, please make sure that all the following items have been
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• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Wrote unit and integration tests.
• Added relevant natspec and godoc comments.
• Provide a conventional commit message to follow the repository standards.
• Re-reviewed Files changed in the GitHub PR explorer.
• Review SonarCloud Report in the comment section below once CI passes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.83%. Comparing base (e7df027) to head (b856233).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #151   +/-   ##
=======================================
  Coverage   96.83%   96.83%           
=======================================
  Files          11       11           
  Lines         537      537           
=======================================
  Hits          520      520           
  Misses         17       17           

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