OpenCommit v1.0.0-beta

feat: ET-1429: Single Line Commit Messages (#4)

* refactor: ET-1429: update prompts.ts to clarify commit message instructions

* feat: ET-1429: add support for generating a single commit message by combining multiple commit messages into a single commit message title and description

* chore: ET-1429: remove extra new line character when joining commit messages

* feat: ET-1429: fix issueID variable being redeclared and not being properly checked for existence before confirming Issue ID

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Co-authored-by: Matthew Salter <matthew.salter@dvla.gov.uk>