Add documents model

[scottyeager]

As a stopgap until the hero filesystem is ready, we are thinking to add a simple document model to the heromodels.

It can possibly be as simple as:

pub struct Document {
	db.Base
pub mut:
	name        string
	contents    string
}

Or if there are concerns about max size on one string entry:

pub struct Document {
	db.Base
pub mut:
	name        string
	contents    []u32 // list of DocumentContents ids
}

pub struct DocumentContents {
	db.Base
pub mut:
	contents    string
}

[scottyeager]

Looks like perhaps we are moving ahead with herofs implementation instead.

[mahmoud-emad]

The herofs is ready now on the development branch. Please use it instead and see the TS client, I will move it into another repo

[mahmoud-emad]

Lets hold