[pallet-revive] Fix caller_is_root return value

[cmichi]

Closes #6767.

The return type of the host function caller_is_root was denoted as u32 in pallet_revive_uapi. This PR fixes the return type to bool.

As a drive-by, the PR re-exports pallet_revive::exec::Origin to extend what can be tested externally.

[cmichi]

cc @athei @pgherveou @xermicus

[xermicus]

Thanks, this seems to be more consistent with other similar API methods.

You'll need to add major prdoc change (I think this constitutes a breaking change even though it only involves unstable methods).

Apparently there are no test fixtures for this.

[cmichi]

/cmd prdoc --audience runtime_dev --bump major

[github-actions]

Sorry, only members of the organization paritytech members can run commands.

[cmichi]

@xermicus Can you trigger the command above?

[xermicus]

/cmd prdoc --audience runtime_dev --bump major

[github-actions]

Command "prdoc --audience runtime_dev --bump major" has failed ❌! See logs here

[xermicus]

@cmichi the bot can't push to your branch. Can you add it manually (there is also the parity-prdoc CLI utility)?

[athei]

Should be a minor for pallet-revive (exporting a new type) and a major for pallet-revive-uapi. Just copy and edit prdoc stuff from past PRs to this pallet.

[github-actions]

Review required! Latest push from author must always be reviewed