refactor(dialog,bottom-sheet,snack-bar): use injector to pass config to container instance

[crisbeto]

Uses DI to pass in the config object to the various global overlay containers. Compared to the current approach, using the injector has the advantage of allowing the config to be used in the constructor and not having to null-check it everywhere.

[josephperrott]

LGTM

[ngbot]

I see that you just added the pr: merge ready label, but the following checks are still failing:
     status "ci/circleci: build" is failing
     status "branch manager" is failing

If you want your PR to be merged, it has to pass all the CI checks.

If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

[josephperrott]

Looks like CircleCI is still failling

[crisbeto]

Seems like the Circle failure was a flake.

[ngbot]

I see that you just added the pr: merge ready label, but the following checks are still failing:
     status "branch manager" is failing
     status "continuous-integration/travis-ci/pr" is pending

If you want your PR to be merged, it has to pass all the CI checks.

If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

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