Add PUT Endpoint for Updating Single Point by ID

[dave90]

Description

This PR adds a new PUT endpoint to update a single memory point in a collection using the Qdrant point ID.

With existing GET and DELETE endpoints for single points, this completes the CRUD operations.

Example of usage:

content = "MIAO!"
metadata = {"custom_key": "new_custom_value"}
req_json = {
    "content": content,
    "metadata": metadata,
}

# edit the point
res = requests.put(
    f"http://localhost:1865/memory/collections/{collection}/points/{point_id}", json=req_json
)
json = res.json()
print(json)

Related to issue #897

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pieroit]

Absolutely perfect, thanks @dave90