client manager: added user context to error handler (#424)

[gabbla]

Pull request

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• bug
• feature

Describe the pull request

This pull request addresses and propose a possible implementation regarding the feature request presented in #424

To Reproduce

When registering an error handler, the user can supply its own context (or nullptr).

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Additional context

[amgross]

Adding context when it is not critical is probably not best practice and this change is API breaking.
I would suggest if you need just to create separate handler for each client and they all can call single function with context they will provide.
Also if want to go with this approach probably need to modify also erpc_client_set_error_handler and erpc_arbitrated_client_set_error_handler