Fixes parse error for variables after fetch

[Vignesh1-art]

Thank you for submitting this pull request! We really appreciate you spending the time to work on these changes.

What is the motivation?

Parsing fails if variables are encountered after FETCH statement

What does this change do?

Fixes this problem. I have added new parsing function to parse list of variables and Parses it after FETCH statement

What is your testing strategy?

Did some manual testing testing, Ran through unit making sure does not break existing things.

Is this related to any issues?

#3028

Does this change need documentation?

If this pull request requires changes, updates, or improvements to the documentation, then add a corresponding issue on the docs.surrealdb.com repository, and link to it here.

• No documentation needed

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

[Vignesh1-art]

@tobiemh or @DelSkayn someone Please review and approve the workflow

[tobiemh]

Hi @Vignesh1-art thanks for this pull request 🎉 ! Parameters within the FETCH clause were not previously supported, so we'll need to add new tests for this behaviour, before we can approve this PR, to ensure that the behaviour works as expected.

It's probably best to add a test in to lib/tests/fetch.rs 😃 .