Environments: specify packages for developer builds (#15256)

* allow environments to specify dev-build packages

* spack develop and spack undevelop commands

* never pull dev-build packges from bincache

* reinstall dev_specs when code has changed; reinstall dependents too

* preserve dev info paths and versions in concretization as special variant

* move install overwrite transaction into installer

* move dev-build argument handling to package.do_install

now that specs are dev-aware, package.do_install can add
necessary args (keep_stage=True, use_cache=False) to dev
builds. This simplifies driving logic in cmd and env._install

* allow 'any' as wildcard for variants

* spec: allow anonymous dependencies

raise an error when constraining by or normalizing an anonymous dep
refactor concretize_develop to remove dev_build variant
refactor tests to check for ^dev_path=any instead of +dev_build

* fix variant class hierarchy

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