feat: split semanticPrefix into type and scope

docs/configuration.md

lib/config/definitions.js

lib/config/migration.js

lib/workers/branch/commit.js

lib/workers/package/versions.js

lib/workers/repository/updates/generate.js

test/config/__snapshots__/migration.spec.js.snap

test/config/__snapshots__/presets.spec.js.snap

test/config/__snapshots__/validation.spec.js.snap

test/config/migration.spec.js

test/config/validation.spec.js

test/manager/__snapshots__/resolve.spec.js.snap

test/workers/branch/__snapshots__/commit.spec.js.snap

test/workers/branch/commit.spec.js

test/workers/package/__snapshots__/index.spec.js.snap

test/workers/package/__snapshots__/versions.spec.js.snap

test/workers/pr/index.spec.js

...s/repository/updates/__snapshots__/branchify.spec.js.snap

...rs/repository/updates/__snapshots__/generate.spec.js.snap

test/workers/repository/updates/generate.spec.js