add llamastack support

[wukaixingxp]

Description

Add llamastack support to Continue. Most of the functions are just calling the openai compatible endpoints, except the completion endpoint for AutoComplete are customized as openai did not have completion anymore.

Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

Screenshots

Tested and passing 7 tests, the failing one is due to model problem.

[netlify]

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[recurseml]

Type incompatibility in schema inheritance: LlamastackConfigSchema extends OpenAIConfigSchema but tries to override the provider field with 'llamastack' which is not included in the parent schema's provider union. This violates Zod's schema extension rules and will cause type errors. To fix this, either add 'llamastack' to the provider union in OpenAIConfigSchema (lines 40-66) or create a different base schema for Llamastack that doesn't extend OpenAIConfigSchema.

📚 Relevant Docs

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[recurseml]

😱 Found 1 issue. Time to roll up your sleeves! 😱

[wukaixingxp]

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

[wukaixingxp]

@sestinj I tried to use my branch to build a new plugin for testing but somehow I can not get my new code installed in the VScode. Following guidance here,I installed the new built plugin successfully, but Continue extension just can not be loaded in VScode. Can you help me on this? Thanks!