Fix
* fix(cli): enable subcommand help even if config is invalid
Refactors configuration loading to use lazy loading by subcommands
triggered by the property access of the runtime_ctx object. Resolves
the issues when running `--help` on subcommands when a configuration
is invalid
Resolves: 840 ([`91d221a`](https://github.com/python-semantic-release/python-semantic-release/commit/91d221a01266e5ca6de5c73296b0a90987847494))