[sr-dev] [kamailio/kamailio] tls: cert serial number can exceed uint64 (PR #3171)

[space88man]

#### Pre-Submission Checklist
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- [X] Commit message has the format required by CONTRIBUTING guide
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- [X] Each component has a single commit (if not, squash them into one commit)
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in `doc/` subfolder, the README file is autogenerated)

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

#### Checklist:
- [X] PR should be backported to stable branches
- [X] Tested changes locally
- [X] Related to issue #3168

#### Description
Certificate serial numbers can be large integers (> 2^64). Parse then as BIGNUM and store the string
in pv; we cannot store as integer anymore. The original code handles 2^64 with a static buffer of 19.
We upsize to 2^256 with a static buffer of 80.

May break configurations that try to extract the sn pv as an integer (does anyone actually do this?)

Addresses #3168.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/3171

-- Commit Summary --

  * tls: cert serial number can exceed uint64

-- File Changes --

    M src/modules/tls/tls_select.c (24)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3171.patch
https://github.com/kamailio/kamailio/pull/3171.diff

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