Identities trust is case sensitive

[tegefaulkes]

Specification

Not all identity providers use case sensitive names. Ideally if the case didn't matter then the command would support that.

For example, github names are case-insensitive but case preserving. So a user name of someDuDe will always be displayed as someDuDe but could be referred to as somedude or even SOMEDUDE. All three of these should be valid when using the identity commands. But only if the identity provider uses case-insensitive names.

This means the provider needs to specify this support.

There was also some mention of using fuzziness. So if a name was misspelled or the case was wrong, the program would suggest the closest known name.

Additional context

Related #40

Tasks

1. Support case-insensitive names depending if the provider supports it
2. Possibly add some kind of fuzzy suggestion for similar names if the provided one is wrong.