Reduces Boilerplate in Server creation

[juanpedromoreno]

Before:

val grpcConfigs: List[GrpcConfig] = List(
    AddService(
      YourService.bindService[YourConcurrentMonad]
    )
  )

  implicit def grpcServerHandler: GrpcServer.Op ~> YourConcurrentMonad =
    new GrpcServerHandler[YourConcurrentMonad] andThen
      new GrpcKInterpreter[YourConcurrentMonad](ServerW(port, grpcConfigs).server)

After this PR:

Before:

val grpcConfigs: List[GrpcConfig] = List(
    AddService(
      YourService.bindService[YourConcurrentMonad]
    )
  )
implicit val serverW: ServerW = ServerW(port, grpcConfigs)

Additionally, this PR:

• Unifies test utilities to DRY between @tagless and @service tests.
• Removes ETA Expansion warnings.
• Removes bootstrapFuture syntax.
• Removes all those imports that are not used anymore.
• Others.

[codecov-io]

Codecov Report

Merging #98 into master will increase coverage by 0.24%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
+ Coverage   83.21%   83.45%   +0.24%     
==========================================
  Files          12       12              
  Lines         137      139       +2     
==========================================
+ Hits          114      116       +2     
  Misses         23       23

Impacted Files	Coverage Δ
rpc/src/main/scala/internal/MonixAdapters.scala	80% <ø> (ø)	⬆️
rpc/src/main/scala/server/implicits.scala	100% <100%> (ø)	⬆️
.../src/main/scala/client/handlers/TaskMHandler.scala	100% <100%> (ø)	⬆️

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