Trigger logger.error level log if unable to load specific plugin

[antobinary]

Describe the bug
On the client we have several logs for the plugin loading process.

• "Loaded plugin PickRandomUserPlugin"
• "2/2 plugins loaded"

However, in the case of not being able to load a plugin (bad url or version incompatibility), we need to log (error level)
the name of the plugin, the error, a logCode so these could be spotted.

[GuiLeme]

In case of bad URL, this is already done, see:

It seems we already have the 'plugin_load_error' logCode for that.

Now, as for the version compatibility, we still need to add a blocker to not load versions that are not compatible (SDK match). IMO, this would need to be done in akka, so the initial idea I had was to have the SDK version duplicated into settings.yml, this would be read by akka and it could block plugin manifests that requires different versions that what the client has.

Of course that's open for discussion, but that's my initial ideia of how to do that.

And on the logging discussion, this error log would be located in akka.

[antobinary]

Thanks! Sounds great! Would you prefer we close now or when you're done the SDK version portion?

[GuiLeme]

Let it open for now, I'll close it with a PR, thank you!