Restructure `dispatch` macro related exports (#1162)

* restructure dispatch macro related exports

* moved Dispatchable to lib.rs

* fix .gitignore final newline

* ".git/.scripts/commands/fmt/fmt.sh"

* fix rustdocs

* wip

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Co-authored-by: Liam Aharon <[email protected]>
Co-authored-by: command-bot <>
Co-authored-by: ordian <[email protected]>