Add dataclass support

[dineshpinto]

dict is too opaque, pls add data class support

can devs do something??

here sample

from dataclasses import dataclass
from typing import List
from datetime import datetime, timedelta
import numpy as np

# The current data structure is:
# bigdict[time_idx][conc_nr][well_nr]['droplet geometry']

# Flattened into a dataclass:
# --------------------------
@dataclass
class ImageData:
    raw_image: str
    droplet_geometry: str
    droplet_status: bool
    conc_idx: int
    well_idx: int
    
    def gray_image(self) -> str:
        return "gray_image"

@dataclass
class Wells:
    image_data: ImageData

@dataclass
class Concentrations:
    wells: List[Wells]

@dataclass
class Images:
    concentrations: List[Concentrations]

# Sample code for testing:
# ------------------------   
TOTAL_WELLS = 2
TOTAL_CONCS = 3
dates = np.arange(
    datetime(2022, 4, 1), 
    datetime(2022, 4, 6), 
    timedelta(days=1)
).astype(datetime)

images = dict()

for date in dates:
    concentrations = []
    for conc_idx, conc in enumerate(range(TOTAL_CONCS)):
        wells = []
        for well_idx, well in enumerate(range(TOTAL_WELLS)):
            image_data = ImageData(
                raw_image="an_image.png", 
                droplet_geometry="round", 
                droplet_status=True, 
                conc_idx=conc_idx, 
                well_idx=well_idx
            )
            wells.append(Wells(image_data))
        concentrations.append(Concentrations(wells))
    images[date] = Images(concentrations=concentrations)
    
images[datetime(2022, 4, 2, 0, 0)].concentrations[2].wells[1].image_data

# Which returns:
# ImageData(raw_image='an_image.png', droplet_geometry='round', droplet_status=True, conc_idx=2, well_idx=1)

[cfsb618]

Thank you very much for your extensive suggestions.
Since I'm still learning the language, this is very helpfull.

I will try to implement classes and dataclasses as soon as I find time for it.
Thanks :)