[Feature Request] Sort activation jobs by desired execution order

[bergundy]

We do this in every lang implementation, better to ensure the right order in Core.

See for reference:
https://github.com/temporalio/sdk-dotnet/pull/29/files/1af1fe8bd952dd0020055e4e8f6b0cb0bebc9eed#diff-7d5de4dd86e4fda729feeeac183fc71ca2f35e30324a3a631228d311e150f1d8R195