Rewrite API.

[akhilman]

Space should be separate object.

Client::space_by_id(&Client, u32) -> Space
Client::space_by_name(&Client, &str) -> Space

To select space by name we should first fetch database schema. Here is how it done in asynctnt python driver:

• fetch_schema function
• constants

Use new call protocol

#2

Define select's iterator types as enum

Here is right values: https://github.com/tarantool/tarantool/blob/952d8d1d4ffe81a0be4d7901f063f6c5059d71f5/src/box/iterator_type.h#L62

[akhilman]

Use build pattern for commands.

Something like:
client.call(&"func_name").arg(arg1).arg(arg_2).do().await
space.index_by_name(&"index_name").select().gt(value).limit(100).do().await
or
client.space_by_name(&"foo").select().by(&"index_nane").gt(value).limit(100).do().await