WIP: Don't copy back or forward EDNS query options

[gcs278]

WIP

TODO:

• Need to filter out EDNS OPTs on forward (hop-by-hop)
• Unit testing
• Proper reference of RFCs for motivation
• Understand why rewrite plugin was adding EDNS in rewrite plugin config back to response
• Investigate: bufsize shouldn't be copied from query to response

Related RFCs:

• Cookies: https://www.rfc-editor.org/rfc/rfc7873.html#section-5.2
• NSID: https://www.rfc-editor.org/rfc/rfc5001.html#section-2.1
• Expire: https://www.rfc-editor.org/rfc/rfc7314.html#section-3.3
• TCP Keepalive: https://datatracker.ietf.org/doc/html/rfc7828#section-3.3.2
• Middlebox: https://datatracker.ietf.org/doc/html/rfc6891#section-6.2.6
• EDNS: https://datatracker.ietf.org/doc/html/rfc6891#section-6.1.2

1. Why is this pull request needed and what does it do?

Doesn't copy query EDNS Options to response and doesn't forward them either.

2. Which issues (if any) are related?

#6188

3. Which documentation changes (if any) need to be made?

TBD

4. Does this introduce a backward incompatible change or deprecation?

TBD

[codecov]

Codecov Report

Attention: 766 lines in your changes are missing coverage. Please review.

Comparison is base (93c57b6) 55.70% compared to head (f354459) 58.49%.
Report is 1104 commits behind head on master.

❗ Current head f354459 differs from pull request most recent head 922e565. Consider uploading reports for the commit 922e565 to get more accurate results

Files	Patch %	Lines
core/dnsserver/server_quic.go	9.13%	177 Missing and 2 partials ⚠️
core/dnsserver/register.go	0.00%	93 Missing ⚠️
core/dnsserver/server.go	15.05%	72 Missing and 7 partials ⚠️
plugin/backend_lookup.go	0.00%	37 Missing ⚠️
plugin/forward/dnstap.go	0.00%	30 Missing ⚠️
plugin/dnstap/setup.go	76.59%	17 Missing and 5 partials ⚠️
core/dnsserver/quic.go	23.07%	20 Missing ⚠️
plugin/forward/setup.go	72.05%	15 Missing and 4 partials ⚠️
plugin/dnssec/cache.go	32.00%	17 Missing ⚠️
core/dnsserver/onstartup.go	30.00%	14 Missing ⚠️
... and 43 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6415      +/-   ##
==========================================
+ Coverage   55.70%   58.49%   +2.79%     
==========================================
  Files         224      251      +27     
  Lines       10016    16566    +6550     
==========================================
+ Hits         5579     9690    +4111     
- Misses       3978     6283    +2305     
- Partials      459      593     +134     

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