Add buildx history command

These commands allow working with build records
of completed and running builds.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

docs/reference/buildx_history_rm.md

@@ -0,0 +1,16 @@
+# docker buildx history rm
+
+<!---MARKER_GEN_START-->
+Remove build records
+
+### Options
+
+| Name            | Type     | Default | Description                              |
+|:----------------|:---------|:--------|:-----------------------------------------|
+| `--all`         | `bool`   |         | Remove all build records                 |
+| `--builder`     | `string` |         | Override the configured builder instance |
+| `-D`, `--debug` | `bool`   |         | Enable debug logging                     |
+
+
+<!---MARKER_GEN_END-->
+