Add lndtest

[linden]

Change Description

This PR adds lndtest, a process controller wrapping lnd, providing typed configuration and optional arguments (similar to lntest but greatly simplified). This is similar to my PR on btcd adding a btcdtest package (btcsuite/btcd#2360). Having a standard testing format across Lightning (lndtest, tapdtest, btcdtest) is incredibly valuable, greatly easing complexity when writing unit tests and lowering the large amount of boilerplate needed.

We've been using this at @JoltzRewards for the past year, frequently tweaking the interface to fit our needs - it has helped us expand our test coverage and testing time by using a process controller instead of a docker-based option like Polar.

        // Create an LND harness.
	lnd := lndtest.New()

	// Create a `lnrpc` client.
	ln := lnrpc.NewLightningClient(lnd)

	// Create an address.
	res, err := ln.NewAddress(context.TODO(), &lnrpc.NewAddressRequest{
		Type: lnrpc.AddressType_TAPROOT_PUBKEY,
	})
	if err != nil {
		panic(err)
	}

^here's an example showing how simple it is to use, only one line of code to create a lnd node, create the underlying wallet, wait for it to be ready & connect to it via RPC.

This interface is very similar to Go's net/http/httptest, which panics instead of throwing errors to simplify.

Steps to Test

Test the example in lndtest/example_test.go

Pull Request Checklist

Testing

• [pending] Your PR passes all CI checks.
• Tests covering the positive and negative (error paths) are included.
• Bug fixes contain tests triggering the bug to prevent regressions.

Code Style and Documentation

• The change is not insubstantial. Typo fixes are not accepted to fight bot spam.
• The change obeys the Code Documentation and Commenting guidelines, and lines wrap at 80.
• Commits follow the Ideal Git Commit Structure.
• Any new logging statements use an appropriate subsystem and logging level.
• Any new lncli commands have appropriate tags in the comments for the rpc in the proto file.
• There is a change description in the release notes, or [skip ci] in the commit message for small changes.

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