feat: json variable access (VF-3664)

[MrPicklePinosaur]

Fixes or implements VF-3664

add ability to access array and object variables.

hello, my name is {name} and i currently work at {job.company}, my favourite ice cream flavour is {favIceCream[0]}

resolves to

hello, my name is bobby bob and i currently work at voiceflow, my favourite ice cream flavour is coffee

Brief description. What is this change?

Implementation details. How do you make this change?

Setup information

Deployment Notes

Related PRs

Checklist

• this is a breaking change and should publish a new major version
• appropriate tests have been written

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

81.5% Coverage
0.0% Duplication

[MrPicklePinosaur]

might need to create special behavior to keep variables unexpanded in the case of index out of range or field not exist

[trs]

Holding for PR changes