Added

• Added support for configuring access tokens; these are used in requests to the toolchain-index in the search and install commands. The tokens can be configured via the config subcommand by setting one of the following variables: keychain-entry or environment-variable.
• Added the experimental flag --x-category to the search command. This will allow users to search for a specific category of toolchains, which is especially helpful for working with experimental toolchains. The current options are: released-ncs-version (default), ncs-version, bundle-id & all.