[RFC]: Allow configuration of ignored command line arguments in calculating hash

Overview

Because of sharding, we may want to allow cross shard caching. By default, lage will use all passed-through CLI args as part of the hash. We should allow tasks that are meant to be run in many boxes to use a consistent hash across those shards.

For example:

lage test --shard 1 --shardTotal 10

should be able to share its cache as other shards running:

lage test --shard 2 --shardTotal 10

We should add a config like this:

module.exports = {
  pipeline: {
    test: {
       ignoredCLIArgs: ['--shard'],
       ignoredEnvVars: [],
       deps: []
    }
  }
}