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  Discussion or Issue link:
  While, Do-while loop implementation for fetching paginated data from an API #1096

What this PR does:
This PR introduces enhancements to support iterative logic within the do block using a while loop construct. Specifically, it adds support for:

A while condition to allow loop execution as long as the condition evaluates to true.

postConditionCheck: false to enable do-while loop semantics.

maxIterations to define an upper limit on loop executions, providing safety against infinite loops.

The changes are accompanied by an example paginated-fetch-example that demonstrates fetching paginated API data until .hasNextPage == true, accumulating results across iterations.

Additional information:
This capability enables richer control flow for iterative data-fetching use cases in serverless workflows, reducing the need for complex custom code and improving the expressiveness of the DSL.

Sample document:

document:
  dsl: '1.0.0'
  namespace: test
  name: paginated-fetch-example
  version: '0.1.0'

do:
  - fetchPaginatedData:
      condition: .hasNextPage == true
      isDoWhile: true # Enables do-while behavior
      limit: 100
      do:
        - fetchPage:
            call: getPageData
            input:
              pageToken: .nextPageToken
            output: .fetchedData
        - accumulateData:
            run: mergeResults
            input:
              newData: .fetchedData
              existingData: .accumulatedResults
            output: .accumulatedResults