Add a LargeBinary/Blob field

Is your feature request related to a problem? Please describe.

We are trying to port a codebase that uses a SQLite Blob field to ormar.

• This is modeled as bytes within Python.

• SQLAlchemy calls this a LargeBinary field.

• peewee calls this a BlobField.

Describe the solution you’d like

Be able to declare a model like:

class File(ormar.Model):
    data: bytes = ormar.LargeBinary()

And have sqlalchemy / Pydantic support like other fields.

[collerek]

Added in #183

[collerek]

Ok, it’s done will be in next release.