Extend merge functionality between mta.yaml and mta extension descriptor

[tal-sapan]

Checklist

• [X] Code compiles correctly
• [X] Relevant tests were added (unit / contract / integration)
• [ ] Relevant logs were added
• [X] Formatting and linting run locally successfully
• [X] All tests passing
• [ ] UA review
• [ ] Design is documented
• [ ] Extended the README / documentation, if necessary
• [ ] Open source is approved

[tal-sapan]

Now merging:

• root parameters
• modules build-parameters
• modules parameters
• modules properties
• modules provides properties
• modules includes
• modules requires properties and parameters
• modules hooks parameters
• modules hooks requires properties and parameters
• resources properties
• resources parameters
• resources requires properties and parameters
• resources active

Maps are merged recursively (extended). Trying to overwrite a non-overwritableble property or parameter is an error (overwritable is true by default). Trying to extend module, resource, provides, requires, hook etc which doesn't exist in the mta.yaml is an error.