How do I get a list of all tags ?

lspace tag list
lspace tags

How do I get a list of tags which have FOO in their name ?

lspace tag list FOO
lspace tags FOO
lspace tags --match substring FOO

(nyi - TODO)

How do I get a list of tags whose name starts with FOO ?

lspace tag list --match glob 'FOO*'
lspace tags --match glob 'FOO*'

(nyi - TODO)

All of the above, for tag values ?

Replace tag list with tag values, and tags with tagv.