Eth secp AWS KMS bulk loading

[jframe]

Add bulk loading of AWS secp256k1 keys in web3signer. This mirrors the bulk loading functionality of BLS signing in Web3signer to load multiple keys from a single configuration.

• Add AWS param to the Eth1Config
• Create a secp AWS bulk loader to retrieve key names and create ArtifactSigners
• Add support to KMS tags
• Update runner to secp AWS bulk loader
• Update runner to add healthcheck for AWS bulk loading
• Acceptance test (see acceptance-tests/src/test/java/tech/pegasys/web3signer/tests/bulkloading/AwsSecretsManagerAcceptanceTest.java)
• Performance test bulk loading to ensure is comparable to secrets manager bulk loading used for BLS

[jframe]

Performance test with 10, 1000 and 10000 keys. In AWS the keys aren't deleted immediately and are marked for deletion. And the API to list keys also returns keys marked for deletion so each test run affects further tests to a degree. I've included the number of keys marked for deletion in the test results too so this can be factored into the results.

Marked for Deletion Keys	Active Keys	Time Taken
1262	10	00:00:44.177
1272	1,000	00:01:45.199
12273	10,000	00:10:36.263