Remove deprecated full parameter from ledger request model

[kennyzlei]

High Level Overview of Change

Remove deprecated full parameter from ledger request model

Context of Change

In the ledger API, the full request parameter has been deprecated for quite awhile now. As of Clio 2.2.0 with this particular commit XRPLF/clio#1360, this API will return a request error if you provide that parameter. This change removes this parameter from the ledger request model. This change would not impact lib users as this using this parameter or setting it to true instead of default false previously would not have been used by rippled or Clio

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Tests (You added tests for code that already exists, or your new feature included in this PR)
• Documentation Updates
• Release

Did you update CHANGELOG.md?

• Yes
• No, this change does not impact library users

Test Plan

Existing integration tests should continue to pass and manual testing of ledger API with xrpl-py against Clio 2.2.0 should succeed

[mvadari]

Please update the changelog.

[kennyzlei]

@mvadari updated the changelog! thanks for the reminder