feat(release-please)!: consolidate manifest and individual releasers (#398)

Major update to release-please which consolidates the manifest and single
releaser behavior into a single set of strategies, which can be used
on both split and mono-repos.

feat: adds support for draft pull requests.
feat: adds support for draft releases.
refactor!: if switching to manifest releaser, release_created will only be set if "." path is published.
refactor!: switch to using @actions/core getBooleanInput, accepted values for true = ["true", "True", "TRUE"], accepted values for false = ["false", "False", "FALSE"]

action.yml

@@ -32,18 +32,10 @@ inputs:
     description: "create a release from a path other than the repository's root"
     required: false
     default: ''
-  monorepo-tags:
-    description: 'add prefix to tags and branches, allowing multiple libraries to be released from the same repository'
-    required: false
-    default: false
   changelog-path:
     description: 'specify a CHANGELOG path other than the root CHANGELOG.md'
     required: false
     default: ''
-  changelog-types:
-    description: 'changlelog commit types'
-    required: false
-    default: ''
   command:
     description: 'release-please command to run, either "github-release", or "release-pr" (defaults to running both)'
     required: false
@@ -56,10 +48,10 @@ inputs:
     description: 'branch to open pull release PR against (detected by default)'
     required: false
     default: ''
-  pull-request-title-pattern:
-    description: 'add title pattern to make release PR, defaults to using "chore${scope}: release${component} ${version}".'
+  changelog-types:
+    description: 'changlelog commit types'
     required: false
-    default: 'chore${scope}: release${component} ${version}'
+    default: ''
   config-file:
     description: 'where can the config file be found in the project?'
     required: false
@@ -84,6 +76,22 @@ inputs:
     description: 'configure github repository URL. Default `process.env.GITHUB_REPOSITORY`'
     required: false
     default: ''
+  monorepo-tags:
+    description: 'add prefix to tags and branches, allowing multiple libraries to be released from the same repository'
+    required: false
+    default: false
+  pull-request-title-pattern:
+    description: 'add title pattern to make release PR, defaults to using "chore${scope}: release${component} ${version}"'
+    required: false
+    default: ''
+  draft:
+    description: 'mark release as a draft'
+    required: false
+    default: false
+  draft-pull-request:
+    description: 'mark pull request as a draft'
+    required: false
+    default: false
 
 runs:
   using: 'node12'