chore: Group dependency updates (#2906)

.scala-steward.conf

@@ -7,4 +7,41 @@ updates.ignore = [
         { groupId = "org.scoverage", artifactId = "sbt-scoverage", version = "1.9.3" }
     ]
 
+# pullRequests.grouping allows you to specify how Scala Steward should group
+# your updates in order to reduce the number of pull-requests.
+#
+# Updates will be placed in the first group with which they match, starting
+# from the first in the array. Those that do not match any group will follow
+# the default procedure (one PR per update).
+#
+# Each element in the array will have the following schema:
+#
+#   - name (mandatory): the name of the group, will be used for things like naming the branch
+#   - title (optional): if provided it will be used as the title for the PR
+#   - filter (mandatory): a non-empty list containing the filters to use to know
+#                         if an update falls into this group.
+#
+# `filter` properties would have this format:
+#
+#    {
+#       version = "major" | "minor" | "patch" | "pre-release" | "build-metadata",
+#       group = "{group}",
+#       artifact = "{artifact}"
+#    }
+#
+# For more information on the values for the `version` filter visit https://semver.org/
+# Every field in a `filter` is optional but at least one must be provided.
+# For grouping every update together a filter like {group = "*"} can be # provided.
+# To create a new PR for each unique combination of artifact-versions, include ${hash} in the name.
+#
+# Default: []
+pullRequests.grouping = [
+  { name = "patches", "title" = "chore: Patch updates", "filter" = [{"version" = "patch"}] },
+  { name = "minor_major", "title" = "chore: Minor/major updates", "filter" = [{"version" = "minor"}, {"version" = "major"}] },
+  { name = "all", "title" = "chore: Dependency updates", "filter" = [{"group" = "*"}] }
+]
+
+# If set, Scala Steward will use this message template for the commit messages and PR titles.
+# Supported variables: ${artifactName}, ${currentVersion}, ${nextVersion} and ${default}
+# Default: "${default}" which is equivalent to "Update ${artifactName} to ${nextVersion}"
 commits.message = "chore: Update ${artifactName} from ${currentVersion} to ${nextVersion}"