Move json getter extensions to core crate

[iantei]

This PR is the implementation for #88

1. Moved the following from routee-compass crate to routee-compass-core crate:
   • compass_configuration_error.rs
   • compass_configuration_field.rs
   • config_json_extension.rs
2. Updated the use from routee-compass to routee-compass-core for the above CompassConfigurationError, CompassConfigurationField and ConfigJsonExtensions
3. Introduced new error type - CompassComponentError which includes PluginError - removed PluginError from CompassConfigurationError since we Plugins is specifically in routee-compass.
4. OutputPluginBuilder utilizes the CompassComponentError, since it needs PluginError.

[robfitzgerald]

Looks great! Thanks @iantei for taking care of this, we have had to use a lot of work-arounds to do similar JSON->Rust object build methods elsewhere in the workspace. We should be able to start unraveling that and also standardize these extension methods as well, since there is some redundancy. 🍻

[robfitzgerald]

@iantei this PR has been approved. we usually leave clicking "Merge pull request" to the PR author. if you're not given that option, let me know, maybe our GitHub repo settings aren't correctly set.

[iantei]

@robfitzgerald I thought the review was still pending from @nreinicke. Thank you for letting me know about the process.

[robfitzgerald]

I thought the review was still pending from @nreinicke

no problem! on this repo, we only require one approval from a write-authorized contributor to merge a PR, unless someone says otherwise (like if the PR is complex and could use a second review).