Enable ipnisync to be served over libp2p.

[gammazero]

This allows all index-providers to upgrade without any changes to their configuration or any changes to infrastructure.

Changes

After upgrade, index-providers will start serving ipnisync and stop using data-transfer/graphsync to serve advertisements.

• For providers serving over data-transfer/graphsync, they will switch to serving HTTP over their existing libp2p servers. They will also stop serving the old 'head' protocol over libp2p, and switch to serving the new HTTP head protocol.
• For providers that are using plain HTTP, they will continue to serve over plain HTTP as the new ipnisync publisher supports that, using the existing configuration. They will also automatically serve HTTP over libp2p if a libp2p host is available.
• Providers can be configured to serve only plain HTTP or only HTTP over libp2p.
• Providers can be configured to serve over the discontinued data-transfer/graphsync as a temporary backup.
• Mirror can serve over both HTTP and libp2p. If m.httpListenAddr has a value, then mirror will serve over HTTP on that address. If there is a libp2p Host, then the mirror will serve HTTP over libp2p using that host.

New Engine Options and Config

• New engine option WithHttpNoLibp2p: If true, disables serving HTTP over libp2p and only serves plain HTTP.
• New config item: config.Ingest.HttpPublisher.NoLibp2p: NoLibp2p disables serving HTTP over libp2p if true. Set this to true to publish over plain HTTP only. This configures the option WithHttpNoLibp2p
• If config.Ingest.PublisherKind is set to "dtsync", a warning is logged.

[codecov-commenter]

Codecov Report

Patch coverage: 40.98% and project coverage change: -0.16% ⚠️

Comparison is base (929faef) 50.15% compared to head (7c16315) 50.00%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
- Coverage   50.15%   50.00%   -0.16%     
==========================================
  Files          61       61              
  Lines        5022     5062      +40     
==========================================
+ Hits         2519     2531      +12     
- Misses       2185     2214      +29     
+ Partials      318      317       -1     

Files Changed	Coverage Δ
cmd/provider/init.go	0.00% <0.00%> (ø)
cmd/provider/internal/config/httppublisher.go	20.00% <0.00%> (-3.53%)	⬇️
engine/options.go	62.28% <ø> (ø)
engine/engine.go	52.52% <44.44%> (+0.17%)	⬆️
cmd/provider/internal/config/ingest.go	52.63% <100.00%> (ø)
mirror/mirror.go	54.82% <100.00%> (-0.58%)	⬇️

... and 1 file with indirect coverage changes

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