[CR] Make INTEGER(BIGNUM *other_value) API public in Titan API
## Summary
There's a need from TitanSim to make INTEGER(BIGNUM *other_value) API public in Titan API.
## Steps and/or TTCN-3 code to reproduce
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## What is the current bug behavior?
The API call is not public
## What is the expected correct behavior?
The API call can be called
## Relevant logs and/or screenshots
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## Possible fixes
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## Titan version
8.0.0
## Platform details (OS type and version)
Any
/cc @aknappqwt
issue