update Features with appropriate installsAfter properties

[joshspicer]

Update features to include an installsAfter property where applicable. Notably, to install after common-utils

[joshspicer]

should wait for devcontainers/cli#163 to be resolved.

[johnnyreilly]

Is this related to devcontainers/spec#109?

[joshspicer]

Yea in a way @johnnyreilly - This issue really represents adding installsAfter: common-utils to mot of the Features in this repo, since common-utils is really designed to be installed earlier on in the build. (I quite liked this comment describing why we are trying to avoid Features having a strict dependency - devcontainers/spec#109 (comment))

The concept of "Composite Features" that @Chuxel was describing is unimplemented, and is a much firmer dependency. installsAfter is a hint but we don't require that the target Features of installsAfter be present.