[sr-dev] [kamailio/kamailio] pv: add string corehash transform (#1218)

[lazedo]

<!-- Kamailio Pull Request Template -->
#### Type Of Change
- [ ] Small bug fix (non-breaking change which fixes an issue)
- [X] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
<!-- Go over all points below, and after creating the PR, tick the checkboxes that apply -->
- [X] PR should be backported to stable branches
- [X] Tested changes locally
- [ ] Related to issue #XXXX (replace XXXX with an open issue number)

#### Description
<!-- Describe your changes in detail -->
adds string transform with optional size parameter to return the slot if supplied

`usage`

- $(var(myvar){s.corehash}) `returns the hash`
- $(var(myvar){s.corehash, 32}) `returns the slot`

`would be great if this can be backported to branch 5.0 and included in next week release`

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1218

-- Commit Summary --

  * pv: add string corehash transform

-- File Changes --

    M src/modules/pv/pv_trans.c (48)
    M src/modules/pv/pv_trans.h (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1218.patch
https://github.com/kamailio/kamailio/pull/1218.diff

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