Batch reading from DB

[0xmikko]

As I mentioned in #34, there is a problem in reading all key-value pairs from DB.

As possible solution it could stream reading (like ReadableStream) or getting values by sending a list of keys like that:

const values = bluzelle.read(keys: string[]);

[njmurarka]

@scottburch Related to #34 and #35

[scottburch]

Thanks for the suggestions. I will be looking into the issues and then we will make a determination as to the best path.
For now you can accomplish that same thing by using a Promise.all.

const values = await Promise.all(keys.map(key => bluzelle.read(key))