Update openai provider to allow o1 models

[salman1993]

NOTE: we shouldn't merge this since it doesn't work that well

Open AI's o1 models don't allow system msg and tool calling so we workaround it in this PR:

• the system msg and tool calls are put into the last user msg
• the tool calls are parsed from the string response msg content

tested this out locally with goose profile:

o1:
  provider: openai
  processor: o1-mini
  accelerator: gpt-4o-mini
  moderator: truncate
  toolkits:
  - name: developer
    requires: {}

^ it works but o1 model doesn't really use the plan tool, so i tried to explicitly ask it but even then it messes it up

[github-actions]

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