feat: Make lnlambda.lnmetrics.info default lamdaServer url

[mdmohsin7]

While setting up connection type of ClientMode.lnlambda, the user has to provide a URL for a lambda server. Those who aren't aware of any, they can use lnlambda.lnmetrics.info, but this thing isn't documented anywhere. Hence this PR makes https://lnlambda.lnmetrics.info the default option for lambda server which the user can change if they want to.

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[Harshit933]

ACK 7147ea5

[vincenzopalazzo]

This is not the solution that I had in mind, but it is just a default value.

The URL should be a choice of the user from a list of options

[vincenzopalazzo]

Suggested change

	controller: TextEditingController(text: setting.lambdaServer),
	controller: TextEditingController(text: setting.lambdaServer),

we can use another component? maybe a PopupMenuButton https://api.flutter.dev/flutter/material/PopupMenuButton-class.html or something similar?

[mdmohsin7]

This is not the solution that I had in mind, but it is just a default value.

The URL should be a choice of the user from a list of options

Yes that can be done. We can have a dropdown from which the user can select one of the many lambda URLs. Among the options in the dropdown, one option can be enter manually. If user selects the enter manually option, then we will show a text field for the user to enter the url. Else we will go with the user selected URL from the dropdown.

[vincenzopalazzo]

Sounds good

[mdmohsin7]

Yes that can be done. We can have a dropdown from which the user can select one of the many lambda URLs. Among the options in the dropdown, one option can be enter manually. If user selects the enter manually option, then we will show a text field for the user to enter the url. Else we will go with the user selected URL from the dropdown.

Here's a demo video of how this will work

CLN.App.-.20.February.2024.mp4

[vincenzopalazzo]

@mdmohsin7 instead to set the first value to an empty one, can you set it to the lnmetrics URL?

Thanks

[mdmohsin7]

@mdmohsin7 instead to set the first value to an empty one, can you set it to the lnmetrics URL?

Thanks

This is done.
Attaching a demo video of it.

CLN.App.-.13.March.2024.mp4

[vincenzopalazzo]

Thanks this looks good.

Can you address the last review that I left?

then if you can rebase on top of master will be a good step, thanks

[vincenzopalazzo]

looks like that it needs a rebase