Add capability for dapr run -f to start apps in parallel

[mukundansundar]

Describe the proposal

This issue is a follow up on the comment in PR #1161.
Currently dapr run -f starts the apps in series one after the other and that might not be the preferable option for users.
We need to parallelize the app starts.
Additional features that should be added are a delay field to delay the starting of the app after the previous app has been started. As well as a feature dependsOn, if some app is dependent on another app starting up first.

cc @philliphoff
related to #1123

Release Note

RELEASE NOTE:

[dapr-bot]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue, help wanted or triaged/resolved) or other activity occurs. Thank you for your contributions.

[dapr-bot]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue, help wanted or triaged/resolved) or other activity occurs. Thank you for your contributions.

[dapr-bot]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue, help wanted or triaged/resolved) or other activity occurs. Thank you for your contributions.

[dapr-bot]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged (pinned, good first issue, help wanted or triaged/resolved) or other activity occurs. Thank you for your contributions.