Run tests on lambda

[slinkydeveloper]

It would be nice to reuse this test suite as it is to run tests on lambda. So far the idea is:

• gradle build will generate jars/zips for lambda
  • For node services, we just reuse whatever packaging tool is used in https://github.com/restatedev/examples/tree/main/typescript/hello-world-lambda
  • For java services, we package using shadowJar
• After packaging, gradle does the upload of the lambda zips/jars to s3. I guess we need unique ids for these s3 buckets, perhaps based on the test run.
• When invoking the test phase, gradle injects some env variables with the name of the s3 bucket where the lambda zips/jars are
• Using the AWS Java SDK we deploy lambdas during RestateDeployer.deploy(), using the s3 bucket as source code location
• Execute the test
• On RestateDeployer.undeploy() we remove the lambdas
• After gradle test we remove the zips/jars from s3

We also probably need to tag the lambdas/s3 buckets with some well known tag like "e2e-tests", such that we can have a periodic cleanup of lambdas/s3 buckets on aws in case the test suite leaves some of them hanging around.