move HttpServer, Http2Server plugins to ServerPlugins

[jbertran]

What does this PR do?

Make HttpServer and Http2Server plugins to ServerPlugin. This moves them to the (semantically) right place in the plugin hierarchy, and gives us access to TracingPlugin behaviour, which allows us to use the service naming API with these plugins.

Additional Notes

With the current state of both plugins, we could make HttpServerPlugin a child of Http2ServerPlugin to minimize code in the former. However, from #312 and #2415 this similarity is only due to the fact that we currently support Http2 in best-effort compatibility mode, so I don't want to couple the 2 implementations together and make it harder to correctly support it down the road.

[github-actions]

Overall package size

Self size: 4.36 MB
Deduped: 60.82 MB
No deduping: 60.86 MB

Dependency sizes

name	version	self size	total size
@datadog/pprof	2.2.1	14.24 MB	15.12 MB
@datadog/native-iast-taint-tracking	1.5.0	14.86 MB	14.86 MB
@datadog/native-appsec	3.2.0	13.38 MB	13.39 MB
protobufjs	7.1.2	2.76 MB	6.55 MB
@datadog/native-iast-rewriter	2.0.1	2.09 MB	2.1 MB
@opentelemetry/core	1.14.0	872.87 kB	1.47 MB
@datadog/native-metrics	2.0.0	898.77 kB	1.3 MB
@opentelemetry/api	1.4.1	780.32 kB	780.32 kB
opentracing	0.14.7	194.81 kB	194.81 kB
semver	7.3.8	88.2 kB	118.6 kB
@datadog/sketches-js	2.1.0	109.9 kB	109.9 kB
lodash.sortby	4.7.0	75.76 kB	75.76 kB
lru-cache	7.14.0	74.95 kB	74.95 kB
ipaddr.js	2.0.1	59.52 kB	59.52 kB
ignore	5.2.0	48.87 kB	48.87 kB
import-in-the-middle	1.3.5	34.34 kB	38.81 kB
istanbul-lib-coverage	3.2.0	29.34 kB	29.34 kB
retry	0.10.1	27.44 kB	27.44 kB
lodash.uniq	4.5.0	25.01 kB	25.01 kB
limiter	1.1.5	23.17 kB	23.17 kB
lodash.kebabcase	4.1.1	17.75 kB	17.75 kB
lodash.pick	4.4.0	16.33 kB	16.33 kB
node-abort-controller	3.0.1	14.33 kB	14.33 kB
crypto-randomuuid	1.0.0	11.18 kB	11.18 kB
diagnostics_channel	1.1.0	7.07 kB	7.07 kB
path-to-regexp	0.1.7	6.78 kB	6.78 kB
koalas	1.0.2	6.47 kB	6.47 kB
methods	1.1.2	5.29 kB	5.29 kB
module-details-from-path	1.0.3	4.47 kB	4.47 kB

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

Merging #3261 (3b53426) into master (89da666) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3261   +/-   ##
=======================================
  Coverage   86.04%   86.05%           
=======================================
  Files         194      196    +2     
  Lines        7518     7523    +5     
  Branches       33       33           
=======================================
+ Hits         6469     6474    +5     
  Misses       1049     1049           

see 2 files with indirect coverage changes

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[pr-commenter]

Benchmarks

Comparing candidate commit 3b53426 in PR branch jbertran/http-servers with baseline commit 89da666 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 462 metrics, 30 unstable metrics.