pmb: Migrate pkgrel_bump to Command (MR 2411)

Also remove args from functions that don't actually need it to
faciliate this.

This does not attempt to fix any of the bugs with pkgrel_bump.

pmb/commands/pkgrel_bump.py

@@ -0,0 +1,33 @@
+# Copyright 2024 Stefan Hansson
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+import sys
+
+from pmb import commands
+from pmb.helpers import logging
+import pmb.helpers.pkgrel_bump
+
+
+class PkgrelBump(commands.Command):
+    def __init__(self, packages: list[str], dry_run: bool, auto: bool) -> None:
+        self.packages = packages
+        self.dry_run = dry_run
+        self.auto = auto
+
+    def run(self) -> None:
+        would_bump = True
+
+        if self.auto:
+            would_bump = bool(pmb.helpers.pkgrel_bump.auto(self.dry_run))
+        else:
+            # Each package must exist
+            for package in self.packages:
+                pmb.helpers.pmaports.find(package)
+
+            # Increase pkgrel
+            for package in self.packages:
+                pmb.helpers.pkgrel_bump.package(package, dry=self.dry_run)
+
+        if self.dry_run and would_bump:
+            logging.info("Pkgrels of package(s) would have been bumped!")
+            sys.exit(1)