fix(lnd): patch subscribe_to_channels for LND v0.21.2+ compatibility

[mutatrum]

Problem

When connected to LND nodes running v0.21.2+, subscribe_to_channels in the lightning package can receive subscription update events where update.type is undefined or missing, or details for the event type are omitted.

Currently, this causes subscribe_to_channels to emit fatal errors:

• ExpectedEventTypeInChannelSubscription
• ExpectedEventDetailsForTypeInChannelSub

These unhandled errors crash the channel subscription listener service in ThunderHub.

Solution

Add patches/lightning+11.1.0.patch (applied automatically via existing patch-package on postinstall):

1. Detect the update type from available event properties (updateActive, updateInactive, updateClosed, updateOpened, updateOpening) if update.type is not explicitly populated.
2. Gracefully ignore unhandled / details-less updates rather than emitting fatal unhandled stream errors that crash the process.

Verification

• Verified patch-package cleanly applies lightning@11.1.0.
• All Jest test suites pass.
• Verified stable channel subscription stream with LND v0.21.2+.

[mutatrum]

Updating to lightning@12 will not completely fix this, there the unknown types will be dropped (see alexbosworth/lightning@92dd949#diff-f37c0d4a072ce95eb1d7607b3234c7a0c25f6a43ee0c58820ef40183f1e363d8).

For future reference, the PR which hopefully fixes this in a future lightning library release: alexbosworth/lightning#214