Make context algorithm use rule based entity matcher

[vmenger]

Describe the feature
Currently, the context algorithm uses a spaCy matcher and phrase matcher internally to find trigger terms. It would be nice to use the RuleBasedEntityMatcher instead, which adds a layer of convenience/usability/configurability over the matcher and phrase matcher. If we have this, we could also use fuzzy and proximity matching for trigger terms, for instance.

Steps:

• Use the RuleBasedEntityMatcher
• Specify how it should be configured
• Add a more strict definition of the json containing the rules?

A use case for the feature
Could be of use for any use case basically.

Would you like to be involved in development?
Yes

Additional context
N/a