xactmon: Deploy xactmon

`xactmon` is a new tool I developed to parse transaction notifications
from banks and automatically import them into my personal finance
tracker.  It is designed in a modular fashion, composed of three main
components:

* Receiver
* Processor
* Importer

Components communicate with one another using an AMQP exchange.
Hypothetically, there could be multipel implementations of the receiver
and importer components.  Right now, there is only a JMAP receiver,
which fetches email messages (from Fastmail), and a Firefly III
importer.  The processor is a singleton, handling notifications from the
receiver, parsing them into a normalized format, and passing them on to
the importer.  It uses a set of rules to decide how to parse the
messages, and supports using either a regular expression with named
capture groups or an Awk script to extract the relevant information.

xactmon/namespace.yaml

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: xactmon
+  labels:
+    app.kubernetes.io/component: xactmon
+    app.kubernetes.io/name: xactmon