Fix the issue with invalid example value generation for an array based query parameter

[yogeshnikam671]

What:
Currently when an example is generated for an endpoint where the query parameter is an array, following kind of query value is generated in the example file.

"query": {
            "queries": "[YRFBM, XURHT, DATUF, QYART, QTEKV]"
 }

This is an invalid format. This PR fixes this issue.

How:
The issue is fixed by properly serialising such array based query parameters and storing it in the example file in the correct format as follows.

"query":{
  "queries": ["YRFBM", "XURHT", "DATUF", "QYART", "QTEKV"]
}

Checklist:

• Documentation added to the README.md OR link to PR on https://github.com/specmatic/specmatic-documentation
• Tests
• Sonar Quality Gate

Issue ID:
Closes: #1453