DTLS 1.3 OID filter extension

[theodorsm]

Description

This PR implements the oid_filters extension for DTLS 1.3 defined in RFC8446 section 4.2.5. This extension allows servers to provide a set of OID/value pairs which it would like the client's certificate to match.

Reference issue

This is not needed for the DTLS 1.3 MVP, but is added for RFC completeness. This is the last extension defined in RFC8446 that we do not have a parser for yet. Note: None of crypto/tls, openssl or wolfssl support this extension yet either.

[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.60%. Comparing base (956d41d) to head (fceedfb).

Files with missing lines	Patch %	Lines
pkg/protocol/extension/oid_filters.go	92.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #814      +/-   ##
==========================================
+ Coverage   82.53%   82.60%   +0.06%     
==========================================
  Files         120      121       +1     
  Lines        6802     6852      +50     
==========================================
+ Hits         5614     5660      +46     
- Misses        778      780       +2     
- Partials      410      412       +2     

Flag	Coverage Δ
go	82.60% <92.00%> (+0.06%)	⬆️

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