Add support for namespaces (specifically to add vectors)

[yraja-faire]

The previous update to #586, only adds the namespace to querying and not to adding the vectors as well

[marcusschiesser]

@yraja-faire Great catch! Thanks - I made a quick fix: #633 - Can you have a look at it? If it works for you, I'll add it to the next release

[junefish]

Having the same issue, would be great to see #633 deployed 😃

[marcusschiesser]

Merged #633 to main - If you like to test before the next release, please try this snapshot: llamaindex@0.0.0-20240314032004