#1274: Add inline compared syntax for N-way set-based output variable comparison

[RakeshBobba03]

#1274: Implements explicit inline comparison syntax for output variables in rules via a new compared: dict block within Output Variables, enabling N-way set-based comparisons (len >= 2) where the first variable serves as baseline and subsequent variables are compared against it. The implementation flattens all variables (siblings + compared children) for UI display while isolating comparison logic to only variables within compared blocks, always uses set-based (order-independent) comparison. Reporting now shows formatted comparison summaries (missing/extra items) followed by raw variable lists, with Excel multi-line rendering support.

Attached are the Rule and dataset used for testing:

CORE-000334.yaml
unit-test-coreid-CG0016-negative.xlsx

[RamilCDISC]

I ran a validation using dev editor and updated the rule to have USUBJID also in output variables like following

Outcome:
  Message: At least one expected variable is missing from dataset
  Output Variables:
    - USUBJID
    - compared:
        - $dataset_variables
        - $expected_variables
    

The AE dataset in attached excel file has USUBJID column but engine returns column not found.

[
  {
    "executionStatus": "success",
    "dataset": "ae.xpt",
    "domain": "AE",
    "variables": [
      "$dataset_variables",
      "$expected_variables",
      "USUBJID"
    ],
    "message": "At least one expected variable is missing from dataset",
    "errors": [
      {
        "value": {
          "$dataset_variables": [
            "STUDYID",
            "DOMAIN",
            "USUBJID",
            "AESEQ",
            "AELNKID",
            "AETERM",
            "AELLT",
            "AELLTCD",
            "AEDECOD",
            "AEPTCD",
            "AEHLT",
            "AEHLTCD",
            "AEHLGT",
            "AEHLGTCD",
            "AEBDSYCD",
            "AESOC",
            "AESOCCD",
            "AESEV",
            "AEACN",
            "AEREL",
            "AEOUT",
            "AESCAN",
            "AESCONG",
            "AESDISAB",
            "AESDTH",
            "AESHOSP",
            "AESLIFE",
            "AESOD",
            "EPOCH",
            "AESTDTC",
            "AEENDTC",
            "AESTDY",
            "AEENDY",
            "AEENRTPT",
            "AEENTPT"
          ],
          "$expected_variables": [
            "AELLT",
            "AELLTCD",
            "AEPTCD",
            "AEHLT",
            "AEHLTCD",
            "AEHLGT",
            "AEHLGTCD",
            "AEBODSYS",
            "AEBDSYCD",
            "AESOC",
            "AESOCCD",
            "AESER",
            "AEACN",
            "AEREL",
            "AESTDTC",
            "AEENDTC"
          ],
          "USUBJID": "Not in dataset"
        },
        "dataset": "ae.xpt"
      }
    ],
    "compare_groups": [
      [
        "$dataset_variables",
        "$expected_variables"
      ]
    ]
  }
]