Add DocServiceConfigurator into boot2-webflux-autoconfigure

[matsumana]

Hi.
Currently can't use DocServiceConfigurator in boot2-webflux-autoconfigure, so I'd like to add it.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #2960 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             master    #2960    +/-   ##
==========================================
  Coverage     73.16%   73.17%            
- Complexity    12208    12266    +58     
==========================================
  Files          1058     1060     +2     
  Lines         47373    47671   +298     
  Branches       5995     6018    +23     
==========================================
+ Hits          34662    34884   +222     
- Misses         9665     9736    +71     
- Partials       3046     3051     +5     

Impacted Files	Coverage Δ	Complexity Δ
.../web/reactive/ArmeriaReactiveWebServerFactory.java	75.78% <100.00%> (+3.55%)	23.00 <1.00> (+4.00)
...a/common/grpc/protocol/ArmeriaStatusException.java	57.14% <0.00%> (-42.86%)	2.00% <0.00%> (-1.00%)
...linGrpc/example/armeria/grpc/kotlin/HelloGrpcKt.kt	82.81% <0.00%> (-6.22%)	0.00% <0.00%> (ø%)
...armeria/internal/common/grpc/HttpStreamReader.java	79.77% <0.00%> (-4.75%)	25.00% <0.00%> (-1.00%)
.../armeria/client/endpoint/dns/DnsEndpointGroup.java	76.56% <0.00%> (-4.69%)	12.00% <0.00%> (-3.00%)
...ria/common/grpc/protocol/ArmeriaMessageFramer.java	90.76% <0.00%> (-2.89%)	25.00% <0.00%> (ø%)
.../linecorp/armeria/client/DefaultClientFactory.java	64.51% <0.00%> (-2.16%)	27.00% <0.00%> (-1.00%)
.../com/linecorp/armeria/server/docs/ServiceInfo.java	78.94% <0.00%> (-1.76%)	20.00% <0.00%> (-1.00%)
...om/linecorp/armeria/client/HttpClientDelegate.java	98.33% <0.00%> (-1.67%)	35.00% <0.00%> (+5.00%)	⬇️
.../com/linecorp/armeria/server/RoutingPredicate.java	69.35% <0.00%> (-1.62%)	20.00% <0.00%> (-1.00%)
... and 31 more

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[minwoox]

Thanks a lot, @matsumana. 🙇‍♂️

[trustin]

LGTM once the comments from @ikhoon and @minwoox are all addressed. 🙇

[trustin]

@matsumana Gentle ping - We're gonna release a new version tomorrow morning 😉

[matsumana]

Updated but #2960 (comment) is remaining.

Sorry, I didn't notice the your comments immediately...
Could you exclude this PR from the new release, if I can't meet the deadline?

[trustin]

Thanks a lot, @matsumana 🙇

[ikhoon]

Thanks a lot! @matsumana ❤️

[matsumana]

Thank you guys for the review!