Allow users to specify a custom record ID when using addRecord()

[jamiewhths]

From AI-3942
Resolved by commit: 2b4bcf6

[nickdickinson]

Noting that this implementation uses the getRecord API call to check if the recordId already exists. If tables are wide, I imagine it may be significantly more efficient to do a table query for the id column with a limit of 1 instead? This could be tested in the future. If that is desirable I can add an issue to the backlog.

[akbertram]

@nickdickinson Because of the way we implement queries, getRecord() will always be faster.