draft: Generate tls certificate with CA

[JssDWt]

Change Description

The go-to grpc library for rust, tonic, uses rustls under the hood. rustls doesn't accept the endpoint of the certificate to also be the certificate authority. The best practice is to use a separate CA certificate that signs the tls certificate. Clients should then use this CA certificate for 'server' authentication. More and more clients use rust, this PR makes rust clients compatible with LND, and LND compatible with certificate best practices.

This is a draft PR. It is missing tests. I tested this with rust manually.

Fixes #5450

** Looking for a concept ACK before I continue writing the tests. **

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[guggero]

Concept ACK! Thanks for looking into this!

[guggero]

We might want some explanatory comments around this.

[guggero]

So the idea is to have this new CA cert generation turned on by default?
Which I guess wouldn't directly change any behavior for existing users that still use the tls.cert on the client side directly to validate the server connection.
Though I still kind of would've expected this new behavior to be opt in, just to not confuse users that don't know what CAs are and what files can/should be copied to the client and which shouldn't.
So perhaps something like --tlsuseca?

[JssDWt]

Thanks for reviewing, and the concept ACK.

I thought to have it enabled by default. If clients still work with the existing tls.cert, and only a new ca.cert is added, that would be preferred in my opinion. That does depend on different clients not breaking obviously. I guess that's hard to predict.

I'll make it --tlsuseca and try to make the generation flow simple enough.

[yyforyongyu]

Concept ACK!