DOMINANT Model init+training using LightningModule

[ParthaPratimBanik]

Have to implement the following methods:

• def __init__(...): it initializes the model
• def forward(...): it executes the model forward operation
• def configure_optimizers(...): it configures optimizer
• def training_step(...): it executes on every training steps + on each epoch
• Must be equal or close to v1.0.0 DOMINANT + inj_cora result