Feat/error recovery dsl

[ltbringer]

In this PR we are adding the first version of a high-level language that enables state changes on certain events defined as rules.
The API of the current state is rigid, to enable the usage and identify areas that require far more flexibility.

Including some example rules:

rules:
  -
    doc: "Remove entities that belong to `now` if other time entities are present."
    remove: entities
    where:
      - entity.grain: second
      - entity.entity_type:
          in: ["time", "datetime"]
      - entity.type: "value"
  -
    doc: "Remove intent named placeholder."
    remove: intents
    where:
      - intent.name:
          in: [placeholder]
      - current_state:
          in: ["non_placeholder", "unsafe"]
  -
    doc: "Rename the intent with the highest confidence to _confirm_ if a certain state is expected."
    find: intents
    where:
      - intent.name:
          in: [placeholder]
      - current_state:
          in: ["non_placeholder", "unsafe"]
    update:
        intent.name: _confirm_
  -
    doc: "Update DateTime entities such that day is set to week's last date."
    find: entities
    where:
      - entity.grain: week
      - entity.entity_type:
          in: ["date", "time", "datetime"]
      - predicted_intent: "future_date" 
    update:
      entity.day: :last_day_of_week

[codecov-commenter]

Codecov Report

Merging #155 (1a6c4f7) into master (55b84ac) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #155    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           50        49     -1     
  Lines         2258      2362   +104     
==========================================
+ Hits          2258      2362   +104     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
dialogy/plugins/__init__.py	100.00% <ø> (ø)
dialogy/types/__init__.py	100.00% <ø> (ø)
dialogy/base/input/__init__.py	100.00% <100.00%> (ø)
...logy/plugins/text/error_recovery/error_recovery.py	100.00% <100.00%> (ø)
dialogy/types/entity/time/__init__.py	100.00% <100.00%> (ø)

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