feat: workflow types support generic params

[dh94]

Improves types usability, instead of writing

type Env {
   MY_WORKFLOW: Workflow;
}

// ... some logic in other file
env.MY_WORKFLOW.create({
  params: {
     some_param: 1
   } as MyWorkflowParams
 });

We could do something like

type Env {
   MY_WORKFLOW: Workflow<MyWorkflowParams>;
}

// ... some logic in other file
env.MY_WORKFLOW.create({
  params: {
     some_param: 1
   }
});

[github-actions]

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[dh94]

I have read the CLA Document and I hereby sign the CLA

[dh94]

not sure what to do with the failed CI check, seems unrelated 😅