#17 support variable in value of assertion

[thomaspoignant]

Description

It was not possible to have an assertion with variables in value.

With this PR you can have this kind of assertion:

{
  "comparison": "equal",
  "property": "name.familyName",
   "value": "{{randomFamilyName}}",
   "source": "response_json"
}

Changes include

• [x] New feature (non-breaking change that adds functionality)

Closes issue(s)

Resolve #17

Checklist

• [x] I have tested this code
• [x] I have added unit test to cover this code
• [x] I have followed the contributing guide

[sonarcloud[bot]]

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