rpc (breaking): Use RxHttpFilter as Sync/AsyncClient filter type

[xerial]

• Add RPC filter tests
• Fix async handler chain
• Fix sync handler chain

[codecov]

Codecov Report

Merging #3141 (7787d71) into main (d1ce2e0) will decrease coverage by 0.03%.
The diff coverage is 90.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3141      +/-   ##
==========================================
- Coverage   82.74%   82.71%   -0.03%     
==========================================
  Files         355      355              
  Lines       14777    14798      +21     
  Branches     2463     2451      -12     
==========================================
+ Hits        12227    12240      +13     
- Misses       2550     2558       +8     

Files Changed	Coverage Δ
...wvlet/airframe/http/client/HttpClientFactory.scala	66.66% <ø> (-3.34%)	⬇️
.../wvlet/airframe/http/client/HttpClientFilter.scala	0.00% <0.00%> (-100.00%)	⬇️
...scala/wvlet/airframe/http/client/HttpClients.scala	84.33% <ø> (ø)
.../wvlet/airframe/http/client/HttpClientConfig.scala	58.62% <50.00%> (+1.95%)	⬆️
.../main/scala/wvlet/airframe/http/RxHttpFilter.scala	72.72% <66.66%> (-2.28%)	⬇️
...scala/wvlet/airframe/http/client/AsyncClient.scala	100.00% <100.00%> (ø)
.../scala/wvlet/airframe/http/client/SyncClient.scala	97.36% <100.00%> (+0.39%)	⬆️
...frame-rx/src/main/scala/wvlet/airframe/rx/Rx.scala	82.17% <100.00%> (-0.83%)	⬇️
...rx/src/main/scala/wvlet/airframe/rx/RxRunner.scala	92.28% <100.00%> (+0.17%)	⬆️

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