fix(sdk)!: dapi-grpc generated files overwritten on conflicting features

[lklimek]

Issue being fixed or feature implemented

When dapi-grpc is built with another set of enabled features, it overwrites previously generated files.
It means that if two crates in a project use dapi-grpc, it might result in non-deterministic build failures,
depending on build order.

What was done?

Each combination of features generates source files in a separate subdirectory.
The following features are considered: client, server.
It means we can have up to 3 different directories (client, server, client_server)

serde feature is controlled using cfg_attr macro.

How Has This Been Tested?

GHA, trying to build it locally

Breaking Changes

default feature set of dapi-grpc crate now includes only client, core and platform.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[shumkov]

👍