Add volume prune --filter support

This change adds support for the `--filter` / `?filters` arguments on
the `podman volume prune` subcommand.

  * Adds ParseFilterArgumentsIntoFilters helper for consistent
    Filter string slice handling
  * Adds `--filter` support to podman volume prune cli
  * Adds `?filters...` support to podman volume prune api
  * Updates apiv2 / e2e tests

Closes #8672

Signed-off-by: Baron Lenardson <lenardson.baron@gmail.com>

docs/source/markdown/podman-volume-prune.1.md

@@ -8,7 +8,8 @@ podman\-volume\-prune - Remove all unused volumes
 
 ## DESCRIPTION
 
-Removes all unused volumes. You will be prompted to confirm the removal of all the
+Removes unused volumes. By default all unused volumes will be removed, the **--filter** flag can
+be used to filter specific volumes. You will be prompted to confirm the removal of all the
 unused volumes. To bypass the confirmation, use the **--force** flag.
 
 
@@ -18,6 +19,17 @@ unused volumes. To bypass the confirmation, use the **--force** flag.
 
 Do not prompt for confirmation.
 
+#### **--filter**
+
+Filter volumes to be pruned. Volumes can be filtered by the following attributes:
+
+- dangling
+- driver
+- label
+- name
+- opt
+- scope
+
 #### **--help**
 
 Print usage statement
@@ -29,6 +41,8 @@ Print usage statement
 $ podman volume prune
 
 $ podman volume prune --force
+
+$ podman volume prune --filter label=mylabel=mylabelvalue
 ```
 
 ## SEE ALSO