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/meson.options b/meson.options
index c701960..296c672 100644
--- a/meson.options
+++ b/meson.options
@@ -64,6 +64,11 @@
     description: 'Enable support for cold redundancy',
 )
 option(
+    'chassis-power',
+    type: 'boolean',
+    description: 'Enable support for chassis power monitoring',
+)
+option(
     'supply-monitor',
     type: 'boolean',
     description: 'Enable support for power supply monitoring',