This commit was previously split into the following parts to ease
review:
- 2d746f68: replace imports
- 4008f0fd: use ecdsa.Signature
- 849e33d1: remove btcec.S256()
- b8f6ebbd: use v2 library correctly
- fa80bca9: bump go modules
This sets the `CustomCaveatCondition` value on rpc middleware requests
if one exists. Previously, this value was always blank even if the
macaroon had a value set for its custom caveat condition.
This commit adds a unique request ID that is the same for each gRPC
request and response intercept message or each request/response message
of a gRPC stream.
This commit adds a new unique intercept message ID that is different for
each message sent to an RPC middleware. This will allow us to re-purpose
the existing request ID field into its original intention, which was to
have a unique ID for a full gRPC request/response pair or gRPC stream as
a whole.
