Add ModernBERT family (#435)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Jonatan Kłosko <jonatanklosko@gmail.com>

Author: 3 people

lib/bumblebee.ex

@@ -175,6 +175,14 @@ defmodule Bumblebee do
     "MistralModel" => {Bumblebee.Text.Mistral, :base},
     "MistralForCausalLM" => {Bumblebee.Text.Mistral, :for_causal_language_modeling},
     "MistralForSequenceClassification" => {Bumblebee.Text.Mistral, :for_sequence_classification},
+    "ModernBertModel" => {Bumblebee.Text.ModernBert, :base},
+    "ModernBertForMaskedLM" => {Bumblebee.Text.ModernBert, :for_masked_language_modeling},
+    "ModernBertForSequenceClassification" =>
+      {Bumblebee.Text.ModernBert, :for_sequence_classification},
+    "ModernBertForTokenClassification" => {Bumblebee.Text.ModernBert, :for_token_classification},
+    "ModernBertDecoderModel" => {Bumblebee.Text.ModernBertDecoder, :base},
+    "ModernBertDecoderForCausalLM" =>
+      {Bumblebee.Text.ModernBertDecoder, :for_causal_language_modeling},
     "MPNetModel" => {Bumblebee.Text.MpNet, :base},
     "MPNetForMaskedLM" => {Bumblebee.Text.MpNet, :for_masked_language_modeling},
     "MPNetForSequenceClassification" => {Bumblebee.Text.MpNet, :for_sequence_classification},
@@ -272,6 +280,8 @@ defmodule Bumblebee do
     "llama" => :llama,
     "mistral" => :llama,
     "mbart" => :mbart,
+    "modernbert" => :modernbert,
+    "modernbert-decoder" => :modernbert,
     "mpnet" => :mpnet,
     "nomic_bert" => :bert,
     "phi" => :code_gen,