This function sets the 'Harmony' API URL to be used in the package. By default,
it uses the production 'Harmony' API ('https://api.harmonydata.ac.uk'), but you can
override it by providing a different URL.
The 'Harmony' API URL to be set. (default: 'https://api.harmonydata.ac.uk')
Author
Ulster University [cph]
Details
The pkg.globals$url variable is a global variable that holds the 'Harmony' API URL
to be used in the package. Once you set the URL using this function, it will be
used in all the relevant functions within the package.