pg-vector support based on Asyncpg

[Dorbmon]

#2 Now, we have pg-vector support.

[gusye1234]

Hi, maybe add an example for pg vector storage? Something like this or a simple benchmark test like this.

[Dorbmon]

Hi, maybe add an example for pg vector storage? Something like this or a simple benchmark test like this.

Done

[gusye1234]

Why use nest_asyncio here? We have nest_asyncio at beginning then remove it. It seems like will cause some deadlock cases

[Dorbmon]

The reason is that we seem to lack an asynchronous initialization function. The entire function runs in an asynchronous environment, and in order to run in a nested asynchronous environment, I used nest_asyncio.

[gusye1234]

Yeah... it could be problematic I think. Do we have to use nest-async to run pg-vector storage?

[Dorbmon]

I need to ensure that the plugin is created correctly, along with the corresponding table. Since the asyncpg library only supports asynchronous operations, I need to obtain a loop for initialization.