Function signature biasing jobs are not cognizant of types

[kgpai]

Problem description

Function signature biasing jobs fail if types are similar but the textual representation is not. This is because the diffing logic here is simply text based and doesnt have a notion of a type.
Eg:
https://app.circleci.com/pipelines/github/facebookincubator/velox/46895/workflows/598bd983-d69a-49b5-8bd9-053372607bd3/jobs/322419

Incompatible changes in function signatures have been detected.

'in(T,T...) -> boolean' is changed to 'in(__user_T1,__user_T1...) -> boolean'.

We should extend the diffing logic to be cognizant of type and thus reduce these false positives.

System information

N/A

CMake log

N/A