Add notes to rejected licenses

[Jake-Shadle]

With the new changes coming once #611 deprecations have been fully removed, licenses will be rejected unless explicitly allowed. To help users, rejected licenses will now have notes printed with the SPDX short id, the full license name, and metadata for the license, eg.

= OpenSSL - OpenSSL License:
=   - FSF Free/Libre
= GPL-3.0 - GNU General Public License v3.0 only:
=  - **DEPRECATED**
=  - OSI approved
=  - FSF Free/Libre
=  - Copyleft

Additionally, the diagnostic for rejected expressions now only includes the span information for rejected licenses, unless the log level is set to info or higher via -L info.

Old:

error[rejected]: failed to satisfy license requirements
   ┌─ /home/jake/code/cargo-deny/deny.toml:71:15
   │
71 │ expression = "ISC AND MIT AND OpenSSL"
   │               ^^^-----^^^-----^^^^^^^
   │               │       │       │
   │               │       │       rejected: license was not explicitly allowed
   │               │       accepted: license is explicitly allowed
   │               license expression retrieved via user override
   │               accepted: license is explicitly allowed
   │

New:

error[rejected]: failed to satisfy license requirements
   ┌─ /home/jake/code/cargo-deny/deny.toml:71:31
   │
71 │ expression = "ISC AND MIT AND OpenSSL"
   │               ----------------^^^^^^^
   │               │               │
   │               │               rejected: license was not explicitly allowed
   │               license expression retrieved via user override
   │