Add CSP DarkNet backbone and classifier (#1774)

* Add CSP DarkNet

* Add CSP DarkNet

* snake_case function names

* change use_depthwise to block_type

Author: sachinprasadhs

keras_nlp/api/models/__init__.py

@@ -50,6 +50,12 @@
 from keras_nlp.src.models.bloom.bloom_tokenizer import BloomTokenizer
 from keras_nlp.src.models.causal_lm import CausalLM
 from keras_nlp.src.models.classifier import Classifier
+from keras_nlp.src.models.csp_darknet.csp_darknet_backbone import (
+    CSPDarkNetBackbone,
+)
+from keras_nlp.src.models.csp_darknet.csp_darknet_image_classifier import (
+    CSPDarkNetImageClassifier,
+)
 from keras_nlp.src.models.deberta_v3.deberta_v3_backbone import (
     DebertaV3Backbone,
 )

keras_nlp/src/models/csp_darknet/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2024 The KerasNLP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.