Feature: adding dynamic variable support

[rsxc]

Description

fixes: #3610

{{$guid}}, {{$randomInt}} etc get interpolated with random values just like postman
https://learning.postman.com/docs/tests-and-scripts/write-scripts/variables-list/

{
  "data": "F000-{{$guid}}"
}
gets replaced with random data
{
  "data": "F000-dshfgdhsj83473979jdkbfs"
}

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
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[tlaloc911]

Hi @rsxc , I get this warning, in console

[@faker-js/faker]: faker.name.findName() is deprecated since v7.4 and will be removed in v8.0. Please use faker.name.fullName() instead.

[rsxc]

Hi @rsxc , I get this warning, in console

[@faker-js/faker]: faker.name.findName() is deprecated since v7.4 and will be removed in v8.0. Please use faker.name.fullName() instead.

I updated the deprecated methods @tlaloc911