feat(sessions): support custom session providers

[reubenmiller]

Note This feature is not intended for users at the moment, but more for people are are interested in writing custom session providers etc.

Allow users to use custom session providers (e.g. read sessions from different password managers).

c8y sessions login --help

The new command, c8y sessions login, provides a mechanism to read session information from different sources:

• stdin
• file
• env
• external command

This should allow users to write custom providers which feed the c8y sessions login command with the initial credentials, and then the command will take care of the authentication checks and/or login using tokens etc.

Examples

bitwarden

bitwarden session provider: https://github.com/reubenmiller/c8y-session-bitwarden

set-session-bitwarden() {
    eval "$(c8y sessions login --from-cmd "c8y-session-bitwarden list --folder c8y" --shell auto)"
}

set-session-bitwarden