Async Implicits provided by frees-rpc Implicits

[juanpedromoreno]

In order to simplify the use of frees-rpc, this PR makes that server and client implicits provide automatically:

• import freestyle.implicits._
• import freestyle.async.implicits._

Hence, users only need to import either:

• import freestyle.rpc.client.implicits._
• import freestyle.rpc.server.implicits._

[raulraja]

With this change would users still able to use?:

import freestyle.implicits._

or would the be forced to use the RPC ones?

[juanpedromoreno]

The RPC ones would include import freestyle.implicits._.. I guess users couldn't use it in the standard way.. ambiguity perhaps?

What does make more sense?

[codecov-io]

Codecov Report

Merging #80 into master will increase coverage by 0.81%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
+ Coverage   88.52%   89.34%   +0.81%     
==========================================
  Files          12       12              
  Lines         122      122              
==========================================
+ Hits          108      109       +1     
+ Misses         14       13       -1

Impacted Files	Coverage Δ
rpc/src/main/scala/server/implicits.scala	100% <ø> (ø)	⬆️
rpc/src/main/scala/RPCAsyncImplicits.scala	80% <ø> (ø)
rpc/src/main/scala/internal/MonixAdapters.scala	84% <0%> (+4%)	⬆️

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[juanpedromoreno]

Users could use the import freestyle.implicits._ if they are not using the Rpc ones.