Add support for the Other Deductions API

[ac000]

Link: https://developer.service.hmrc.gov.uk/api-documentation/docs/api/service/other-deductions-api/2.0/oas/page

[Copilot]

Pull Request Overview

This PR adds support for the HMRC Other Deductions API version 2.0, enabling interaction with endpoints for managing other deductions data in the UK's Making Tax Digital system.

• Adds new API endpoint definitions for Other Deductions (amend, get, delete operations)
• Introduces new error handling for ship name format validation
• Updates documentation to include the new API support

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/mtd-hmrc-err.c	Adds error mapping for ship name format validation
src/api_endpoints.h	Defines Other Deductions API configuration and endpoint structures
include/libmtdac/mtd.h	Adds enum values for new error type, API, and endpoints
docs/man/man3/libmtdac_mtd.h.3	Updates man page with new API definitions and date
docs/man/man3/libmtdac.3	Adds Other Deductions API documentation reference
docs/libmtdac_mtd.h.3.rst	Updates RST documentation with new API definitions
docs/libmtdac.3.rst	Adds Other Deductions API documentation link
README.rst	Updates API list to include Other Deductions with version 2.0

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