🍥 DNS query strategy: Add UseIPFailFast

[database64128]

This strategy enables both IPv4 and IPv6. When either A or AAAA query fails, the lookup operation is deemed a failure.

Fixes #1209.

[codecov-commenter]

Codecov Report

Merging #1222 (31b1a6c) into master (c91f98c) will decrease coverage by 0.03%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master    #1222      +/-   ##
==========================================
- Coverage   44.87%   44.84%   -0.04%     
==========================================
  Files         485      482       -3     
  Lines       29505    29413      -92     
==========================================
- Hits        13241    13190      -51     
+ Misses      14870    14830      -40     
+ Partials     1394     1393       -1     

Impacted Files	Coverage Δ
app/dns/config.pb.go	22.44% <ø> (ø)
app/dns/nameserver_doh.go	67.72% <0.00%> (-1.26%)	⬇️
app/dns/nameserver_quic.go	72.60% <0.00%> (-1.36%)	⬇️
app/dns/nameserver_tcp.go	67.75% <0.00%> (-1.30%)	⬇️
app/dns/nameserver_udp.go	79.53% <0.00%> (-1.91%)	⬇️
features/dns/client.go	100.00% <ø> (ø)
infra/conf/dns.go	63.13% <0.00%> (-0.59%)	⬇️
app/dns/dns.go	71.12% <28.57%> (-3.45%)	⬇️
transport/internet/udp/dispatcher.go	64.76% <0.00%> (-12.39%)	⬇️
transport/internet/domainsocket/config.go	36.84% <0.00%> (-10.53%)	⬇️
... and 6 more

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[Mukou-Aoi]

This PR should wait for #1232 to be resolved first.

[database64128]

The code changes in this PR have been relicensed under AGPLv3 and applied to a downstream fork Shadowsocks-NET/v2ray-go. Due to license requirements, these changes may not be applied to v2fly/v2ray-core.