Restructure macro-related exports into private mods for frame (#14375)

* minor refactor

* Update frame/election-provider-support/src/lib.rs

* Update frame/election-provider-support/solution-type/src/lib.rs

Co-authored-by: Bastian Köcher <[email protected]>

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

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Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: command-bot <>