Fix path parameters when OpenAPI specification is imported (#2513)

[Madh93]

Description

Fixes #2513 to support path parameters when OpenAPI specification is imported.

It replaces all path placeholders enclosed in curly braces with colons when the OpenAPI spec is parsed.

Before

meta {
  name: get -users--id-
  type: http
  seq: 1
}

get {
  url: http://api.example.com/v1/users/{id}
  body: none
  auth: none
}

params:query {
  ~metadata: 
}

params:path {
  id: 
}

After

meta {
  name: get -users--id
  type: http
  seq: 2
}

get {
  url: http://api.example.com/v1/users/:id
  body: none
  auth: none
}

params:query {
  ~metadata: 
}

params:path {
  id: 
}

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.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

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