guides: support verbatim variables

[millotp]

🧭 What and Why

🎟 JIRA Ticket: DI-2984

Support variables insertion in the guides, to use an existing variable instead of defining everything in json.
The syntax is:

"parameters": {
  "propName": "$var: theVarToInsert"
}

[algolia-bot]

✔️ Code generated!

Name	Link
🪓 Triggered by	88ff534dc24a4654700f40b8a94bf2b47b33a903
🍃 Generated commit	8cc07dd106bf1649531d2cd8e0a3b4ed392682ff
🌲 Generated branch	generated/feat/verbatim

📊 Benchmark results

Benchmarks performed on the method using a mock server, the results might not reflect the real-world performance.

Language	Req/s
javascript	1648
go	1611
php	1508
csharp	1349
java	1108
python	1016
ruby	854
swift	765

[Fluf22]

We will need to write a guide on how to write a guide

[millotp]

We will need to write a guide on how to write a guide

there is a ticket for that !