Add interface for retrieving environment params
The goal of this commit is to add an interface to `metadata.Manager` that allows retrieving of all environment params: `getEnvironmentParams(envName)`. This is done by: 1. Adding functionality to the snippet parser to get all environment params out of the snippet read from `environments/<env>/params.libsonnet` 2. Adding functionality to the snippet parser to get all component params out of the snippet read from `components/params.libsonnet` 3. Having the `metadata.Manager` implementation handle the 'joining' of params from 1) and 2), and returning that result.
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