Unresponsive node bypasses timeout setting

[ok300]

Customer reported that calling sendPayment() returned only 5 minutes later with

"RpcError { code: None, message: \"no response from lightningd\",

Our Config::payment_timeout_sec

https://github.com/breez/breez-sdk/blob/77f0b65ba340767de6e290b1a579ea5baf044a16/libs/sdk-core/src/models.rs#L457

should have kicked it.

We should apply this timeout also as a connection timeout when calling GL methods.

[sagarsubedi]

FYI: Here is the entire exception I got after about 5 minutes 27 seconds:

FrbAnyhowException(Generic: Generic: status: Unknown, message: "Error calling method Pay: RpcError { code: None, message: "no response from lightningd", data: None }", details: [], metadata: MetadataMap { headers: {"content-type": "application/grpc", "date": "Tue, 27 Feb 2024 18:04:20 GMT", "content-length": "0"} }

This is a flutter app. The function used was sendPayment()