chassis-power: Create initial application

Create the new chassis power monitor application and a service file that
would start it. Make the new application available via a meson option.

Tested: Verified the service and application start with no errors.
```
root@p10bmc:~# systemctl status phosphor-chassis-power.service
● phosphor-chassis-power.service - Chassis Power Monitor
     Loaded: loaded
(/usr/lib/systemd/system/phosphor-chassis-power.service; enabled;
preset: enabled)
     Active: active (running) since Mon 2025-11-10 19:08:09 UTC; 4min 28s ago
 Invocation: 6f0cac0ee4e04066b68ba448aa2d7ccc
   Main PID: 549 (phosphor-chassi)
        CPU: 29ms
     CGroup: /system.slice/phosphor-chassis-power.service
             └─549 /usr/libexec/phosphor-power/phosphor-chassis-power

Nov 10 19:08:09 p10bmc systemd[1]: Started Chassis Power Monitor.

root@p10bmc:~# ps |grep chassis
  549 root     14928 S /usr/libexec/phosphor-power/phosphor-chassis-power
```

Change-Id: Ia0ab5bc6c578b8203f09feec9b6927059db0f883
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/phosphor-chassis-power/src/main.cpp b/phosphor-chassis-power/src/main.cpp
new file mode 100644
index 0000000..f75994a
--- /dev/null
+++ b/phosphor-chassis-power/src/main.cpp
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright 2025 IBM Corporation
+
+#include <sdbusplus/async.hpp>
+
+int main()
+{
+    sdbusplus::async::context ctx;
+    ctx.run();
+}