Add device-type FortiGate 900G (#3204)

* Add devicetype FortiGate 900G

* Add additional general device information

* Update interface names as stated on device

* Add link to datasheet

* Change PowerPort schema to ModuleBay schema

---------

Co-authored-by: Harry <Harry@cadby.co.uk>

device-types/Fortinet/FG-900G.yaml

@@ -0,0 +1,93 @@
+---
+manufacturer: Fortinet
+model: FortiGate 900G
+slug: fortinet-fg-900g
+part_number: FG-900G
+u_height: 1
+airflow: front-to-rear
+weight: 7.25
+weight_unit: kg
+is_full_depth: false
+comments: '[Fortinet FortiGate 900G Data Sheet](https://www.fortinet.com/content/dam/fortinet/assets/data-sheets/pdf/fortigate-900g-series.pdf)'
+console-ports:
+  - name: Console
+    type: rj-45
+interfaces:
+  - name: ha
+    type: 2.5gbase-t
+  - name: mgmt
+    type: 1000base-t
+    mgmt_only: true
+  - name: port1
+    type: 1000base-t
+  - name: port2
+    type: 1000base-t
+  - name: port3
+    type: 1000base-t
+  - name: port4
+    type: 1000base-t
+  - name: port5
+    type: 1000base-t
+  - name: port6
+    type: 1000base-t
+  - name: port7
+    type: 1000base-t
+  - name: port8
+    type: 1000base-t
+  - name: port9
+    type: 1000base-t
+  - name: port10
+    type: 1000base-t
+  - name: port11
+    type: 1000base-t
+  - name: port12
+    type: 1000base-t
+  - name: port13
+    type: 1000base-t
+  - name: port14
+    type: 1000base-t
+  - name: port15
+    type: 1000base-t
+  - name: port16
+    type: 1000base-t
+  - name: port17
+    type: 1000base-x-sfp
+  - name: port18
+    type: 1000base-x-sfp
+  - name: port19
+    type: 1000base-x-sfp
+  - name: port20
+    type: 1000base-x-sfp
+  - name: port21
+    type: 1000base-x-sfp
+  - name: port22
+    type: 1000base-x-sfp
+  - name: port23
+    type: 1000base-x-sfp
+  - name: port24
+    type: 1000base-x-sfp
+  - name: X1
+    type: 10gbase-x-sfpp
+  - name: X2
+    type: 10gbase-x-sfpp
+  - name: X3
+    type: 10gbase-x-sfpp
+  - name: X4
+    type: 10gbase-x-sfpp
+  - name: X5
+    type: 25gbase-x-sfp28
+    comments: ULL (ultra-low latency)
+  - name: X6
+    type: 25gbase-x-sfp28
+    comments: ULL (ultra-low latency)
+  - name: X7
+    type: 25gbase-x-sfp28
+    comments: ULL (ultra-low latency)
+  - name: X8
+    type: 25gbase-x-sfp28
+    comments: ULL (ultra-low latency)
+module-bays:
+  - name: PS1
+    position: '1'
+  - name: PS2
+    position: '2'