feat: allow consumers to choose capture level

[jlp-craigmorten]

Fixes #51

Adds a new capture option to majority of commands.

Calling .start({ capture }) sets a global default for that screen reader run which can be overridden on a per command basis. The default if not passed is true to capture all spoken phrases and item text. Other options are false for no capture and "initial" for capturing just the first "page" of output.

Additionally adds logic to ensure the screen reader is/is not running as expected for different commands.