add dependency map

[Phiph]

This PR aims to solve #1608 & #652

it introduces the dependsOn yaml that looks for services that match the name and ensure the startup order is honoured.

For Example:

name: VotingSample
services:
- name: vote
  project: vote.csproj
  dependsOn:
    - redis
- name: worker
  include: ../worker/tye.yaml
- name: redis
  image: redis
  bindings:
    - port: 6379
      connectionString: ${host}:${port}

Should await the Redis server to start before the vote service.

I will write more E2E tests to validate this and ensure that environment variables are added to services.

[davidfowl]

Should await the Redis server to start before the vote service.

This will leave you with brittle service code. It encourages the wrong defaults.

[Phiph]

referring issue #443

[Phiph]

Should await the Redis server to start before the vote service.

This will leave you with brittle service code. It encourages the wrong defaults.

Totally get that your services should be fault tolerant, but I think It would help support the way tye injects env variables. Do you have any suggestions :)