[ENH] Starting Self Supervised Model with first example

[hadifawaz1999]

Adding the SSL submodule in transformations collection with no base class for now, adding more examples i will see if a base is needed

Started by adding TRILITE first example

TODO: add a test for TRILITE

Usage:

from aeon.transformations.collection.self_supervised import TRILITE
from aeon.networks import FCNNetwork
from aeon.classification.distance_based import KNeighborsTimeSeriesClassifier
from aeon.datasets import load_unit_test

if __name__ == '__main__':
    X_train, y_train = load_unit_test(split="train")
    X_test, y_test = load_unit_test(split="test")
    
    net = FCNNetwork(n_layers=1,n_filters=2,kernel_size=2)
    
    ssl = TRILITE(backbone_network=net, latent_space_dim=2, n_epochs=3,
                  verbose=True,
                  save_best_model=True)
    ssl.fit(X_train)
    
    X_train_transformed = ssl.transform(X_train)
    X_test_transformed = ssl.transform(X_test)
    
    nn = KNeighborsTimeSeriesClassifier(distance="euclidean")
    nn.fit(X_train_transformed, y_train)
    y_pred = nn.predict(X_test_transformed)
    
    ssl_loaded = TRILITE(latent_space_dim=2)
    ssl_loaded.load_model("./best_model.keras")
    
    X_train_transformed = ssl_loaded.transform(X_train)
    X_test_transformed = ssl_loaded.transform(X_test)
    
    nn = KNeighborsTimeSeriesClassifier(distance="euclidean")
    nn.fit(X_train_transformed, y_train)
    y_pred = nn.predict(X_test_transformed)

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ].
I have added the following labels to this PR based on the changes made: [ $\color{#41A8F6}{\textsf{transformations}}$ ]. Feel free to change these if they do not properly represent the PR.

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