CLOUDP-266130: Add changelog core logic

[andreaangiolillo]

Proposed changes

Jira ticket: CLOUDP-266130

This PR adds changelog core logic to FOAS CLI

./bin/foascli changelog create -b ~/Downloads/test/base -r ~/Downloads/test/revision -e ~/Downloads/test/exceptions.yaml                         
Printing the checks
[
  {
    "Attributes": null,
    "Id": "api-schema-removed",
    "Args": [
      "AzureHardwareSpec20250101"
    ],
    "Comment": "",
    "Level": 3,
    "Component": "schemas",
    "SourceFile": "",
    "SourceLine": 0,
    "SourceLineEnd": 0,
    "SourceColumn": 0,
    "SourceColumnEnd": 0
  },
.....
]