Splits core into Server and Client submodules

[juanpedromoreno]

This PR splits up the current code base in different modules, mainly separating client and server. The main goal is delimiting the dependencies usage since when bootstrapping a server we
don't want the client dependencies and vice versa.

Additionally, other sub-modules have been created for the sake of simplicity.

• frees-rpc-common containing protocol types, with the minimum set of dependencies.
• frees-rpc-async containing just the async implicit instances (NTs between effect/async types).
• frees-rpc-internal where the macros are placed.
• frees-rpc-client-core: algebra and code related to the RPC clients.
• frees-rpc-client-netty: it doesn't add any additional code, just a transport layer provider based on grpc-netty.
• frees-rpc-client-okhttp: similar to the Netty one, it doesn't add any additional code, just a transport layer provider based on grpc-okhttp.
• frees-rpc-server: algebra and code related to the RPC server.
• frees-rpc-config: helpers to be able to load the client and the server configuration.
• frees-rpc-tests: it won't be published, it just houses tests for client and server altogether.

Breaking changes: algebras and handlers TaskMHandler, ChannelM, ChannelMHandler have been removed because they are not needed anymore.

[codecov-io]

Codecov Report

Merging #113 into master will decrease coverage by 7.69%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master     #113     +/-   ##
=========================================
- Coverage   83.62%   75.92%   -7.7%     
=========================================
  Files          14       12      -2     
  Lines         116      108      -8     
=========================================
- Hits           97       82     -15     
- Misses         19       26      +7

Impacted Files	Coverage Δ
...er/src/main/scala/handlers/GrpcServerHandler.scala	86.66% <ø> (ø)
modules/internal/src/main/scala/server/calls.scala	81.48% <ø> (ø)
modules/client/src/main/scala/package.scala	0% <ø> (ø)
.../src/main/scala/server/GRPCServiceDefBuilder.scala	100% <ø> (ø)
...odules/internal/src/main/scala/MonixAdapters.scala	80% <ø> (ø)
modules/server/src/main/scala/GrpcConfig.scala	100% <ø> (ø)
...dules/async/src/main/scala/RPCAsyncImplicits.scala	83.33% <ø> (ø)
modules/server/src/main/scala/package.scala	0% <ø> (ø)
modules/internal/src/main/scala/client/calls.scala	100% <ø> (ø)
modules/server/src/main/scala/implicits.scala	0% <0%> (ø)
... and 3 more

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[fedefernandez]

I know this is not related to the PR, but why is this called IOCapture? Does it make sense to rename it?

[fedefernandez]