Snowflake provider support: added embeddings, PAT, account_id

[ea-rus]

Title

Improved snowflake provider support: embeddings, PAT, account_id

Relevant issues

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature

Changes

Improved snowflake provider support:

1. Added cortex embeddings support

Example:

response = litellm.embedding(
    "snowflake/snowflake-arctic-embed-l-v2.0",
    input=['test',],
)

2. Added support of programmatic access tokens (PAT)
   The lifetime of PAT is much longer than JWT key

Example:

response = litellm.completion(
    "snowflake/mistral-large",
    messages=[...],
    pat_key="xxxxx"  # <--
)

3. Added option to pass snowflake account id as parameter. (At the moment it is possible to do only in via ENV variable)

Example:

response = litellm.completion(
    "snowflake/mistral-large",
    messages=[...],
    account_id="AAAA-BBBB"  # <--
)

pat_key and account_id parameters work both for embeding and completion.

Tests:

[vercel]

@ea-rus is attempting to deploy a commit to the CLERKIEAI Team on Vercel.

A member of the Team first needs to authorize it.

[krrishdholakia]

let me know when this is ready for review! @ea-rus

[ea-rus]

@krrishdholakia, thank you. It is ready for review, I've just marked it
It has error in unit tests but the same error I have on current main branch.