Algod endpoint: set log level

[agodnic]

Summary

This pull request introduces the endpoint POST /v2/node/log-level, which lets operators set the node's log level.

Example

$ curl -Ss -H "X-Algo-API-Token: $(cat ~/.algorand/algod.admin.token)" 'http://127.0.0.1:8080/v2/node/log-level' -X POST -d '{"log-level": "info"}' -v
*   Trying 127.0.0.1:8080...
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> POST /v2/node/log-level HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.81.0
> Accept: */*
> X-Algo-API-Token: 27ce0afafdb106203e67541c0ad76d5ee1307a0a1b3e006d0b4c1129d547b936
> Content-Length: 21
> Content-Type: application/x-www-form-urlencoded
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Vary: Accept-Encoding
< Vary: Origin
< Date: Sun, 07 Dec 2025 23:49:53 GMT
< Content-Length: 0
< 
* Connection #0 to host 127.0.0.1 left intact

[urtho]

There is also a Trace level in logrus - not used atm but lets add it anyway.

[urtho]

Logging will be split into many subsystems eventually so lets add "mask" (no idea about the name) param that has:
all,main,libp2p values for now that allows to choose which subsystems log level is to be changed.

Also calling the endpoints with a mask param but no log-level param should reset the logging to default value.

[agodnic]

libp2p subsystem was removed.

This is a sample of what an API call would look like:

curl -Ss \
'http://127.0.0.1:8080/v2/node/log-level' \
-X POST \
-H "X-Algo-API-Token: $(cat ~/.algorand/algod.admin.token)" \
-d '{"mask": [{"subsystem": "main", "log-level": "error"}]}'