Tasks CLI: Add `create` command

[mafredri]

Implement coder task create (alias run) to create and run a task.

Scope

• Usage: coder task create <template-or-recipe> --name <str> [--input <text> | stdin] [--wait] [--wait-timeout <dur>] [--param k=v]...
• MVP <template-or-recipe>: <template-uuid> or <template-name>[@version]. Defer recipes (<recipe-uuid>, :<recipe-name>) to post-MVP.
• Support --input (alias --prompt) from flag or stdin.
• --wait blocks until status is idle or completed and streams logs while waiting.
• If --name omitted, backend generates a name.
• Calls POST /tasks (maps input to prompt parameter).
• Include minimal SDK surface + tests.

Depends on: #893, #898

References: #838

[johnstcn]

@DanielleMaywood can we close this out?

[DanielleMaywood]

@johnstcn I'm not sure as the feature set implemented in coder/coder#19492 doesn't completely match what is set out in the issue.

Support --input (alias --prompt) from flag or stdin.

We only support --input and flag

--wait blocks until status is idle or completed and streams logs while waiting.

This has not been implemented

[DanielleMaywood]

A minimal implementation of this has been achieved, tracking the remainder in #956