abstract reduction in jwt

[darkskygit]

In the original design, jwt will be responsible for docking multiple backends and supporting the export of different formats, so the data structure and API are abstracted in multiple layers.
At present, we have re-implemented (or plan to re-implement) these more complex logics in jwst using rust, and we need to streamline the abstraction of jwt to make it easier to use.
I plan to simplify the abstraction of jwt to a level similar to that of @blocksuite/store, but unlike @blocksuite/store, the interface provided by jwt can more flexibly construct block graphs that refer to each other, not for rich text editors The workspaces-pages-blocks tree structure.
The issue is planned to be completed before May, and the pre-requisites are: toeverything/AFFiNE#238

[doodlewind]

Let's tracked in #376

[darkskygit]

Let's tracked in toeverything/OctoBase#376

jwt not included in affine cloud yet, may include in client