chore(remap): docs for the Remap type functions

[StephenWakely]

This adds docs for the functions: array, bool, int, float, timestamp, object.

Also noted some errors with the parse_regex function docs - they raise an error if no match is found.

Have also been through the functions and updated the examples for any fallible functions to be called with an appended !.

Have updated the docs to refer to maps as objects.

[StephenWakely]

@binarylogic Ok, I have removed the ! from the function calls in the examples. I have left it in the examples for the type functions that this PR is primarily about, since the whole point of these functions is to error if their parameter is the wrong type.

For example:

  format_timestamp(timestamp!(.timestamp), format: "%+")

The timestamp! call only makes sense because we are handling the error before passing it to format_timestamp.