Implement Modular Layer Architecture

[Kcodess2807]

Description: PyDeepFlow currently has monolithic model classes. Modern frameworks use modular layer architecture where each layer is an independent, composable unit. This enables flexible model building and easier debugging.

Current Problem:

# Current - rigid, monolithic structure
model = Multi_Layer_ANN(X_train, y_train, [128, 64], ['relu', 'sigmoid'])
# Can't inspect individual layers, can't reuse layers

[Kcodess2807]

assign it to me, if found useful @ravin-d-27

[ravin-d-27]

@Kcodess2807 , this is actually a great improvement. Please start working on it! I am assigning this issue! Thank you!