kmd: key management daemon

[makramkd]

Potential keystore approaches:

• Separate keystore container running as a daemon (kmd), each CCV/executor container comms with it to sign msgs/txes
  • Notes:
    • Manual key management: nops create keys that they need, configure the CCVs/executors appropriately with the key names they will use to sign msgs/txes
      • Can give them explicit instructions on how to create keys - it'll be using the keystore CLI which is standard
    • Separate container just for the keystore needs to be managed appropriately. Can hook it up to a file or a database though latter may be preferred by ops due to things like database backups.
    • Most closely resembles the chainlink node setup, which has one keystore for the entire node (many jobs) so not a big shift for nops
• Each CCV/executor container maintains its own keystore (i.e. imports keystore as a lib)
  • Notes:
    • Each CCV/executor will generate its own keys -> they'll be different -> setting configs becomes more cumbersome for chainlink
    • If we use the keystore with postgres storage this becomes even more cumbersome, though might be able to make it work with the same table/db.
    • Simpler from a # of containers perspective
    • More complex from a key management perspective, since each container maintains its own keystore

[github-actions]

Code coverage report:

Package	main	mk/part2/NONEVM-3705	diff
github.com/smartcontractkit/chainlink-ccv/aggregator	46.92%	46.92%	+0.00%
github.com/smartcontractkit/chainlink-ccv/cmd	0.00%	0.00%	+0.00%
github.com/smartcontractkit/chainlink-ccv/committee	100.00%	100.00%	+0.00%
github.com/smartcontractkit/chainlink-ccv/common	52.13%	52.13%	+0.00%
github.com/smartcontractkit/chainlink-ccv/executor	38.45%	38.45%	+0.00%
github.com/smartcontractkit/chainlink-ccv/indexer	37.77%	37.77%	+0.00%

WARNING: go tool cover failed for coverage_target.out
cover: open /home/runner/work/chainlink-ccv/chainlink-ccv/indexer/pkg/api/middleware/path_normalizer.go: no such file or directory
WARNING: go tool cover failed for coverage.out
cover: open /home/runner/work/chainlink-ccv/chainlink-ccv/indexer/pkg/api/middleware/path_normalizer.go: no such file or directory