Extend [[ https://github.com/vyos/vyos-1x/blob/c497848082efd62ae8893929afd2530677ce336d/src/services/vyos-http-api-server#L104C7-L121 | ConfigureModel ]] and related modules to support load configuration in JSON format.
```
"configFormat": "json | json_ast | raw (default)
```
Ability to use `load` for some `Section`
For example, for NAT section we want to `load` via the API
```
{"source": {"rule": {"100": {"outbound-interface": "eth0", "translation": {"address": "masquerade"}}}}}
```
Expected configuration:
```
set nat source rule 100 outbound-interface 'eth0'
set nat source rule 100 translation address 'masquerade'
```
Proposed query:
op = <set|load> - set on load configuration
configFormat = <json|json_ast|raw (default)>
path = Name of the section which we want to configure, maybe replace to `section`
data = config in JSON format for required section (path)
```
curl -k --location --request POST 'https://192.168.122.14/configure' \
--form data='{"op": "<set|load>", "configFormat": "json", "path": ["nat"], "data": [{"source": {"rule": {"100": {"outbound-interface": "eth0", "translation": {"address": "masquerade"}]}}}}]}' \
--form key='foo'
```