add arabic processors and configs

[lilithgrigoryan]

This PR introduces the following:

1. A processor and config file for the Massive Arabic Speech Corpus (MASC), MCV, Flaurs Arabic, MediaSpeech Arabic, EveryAyah with tests.
2. A processor to split manifest files by caption file segments.
3. A processor to aggregate segments into longer ones.
4. A processor to apply regular expressions to caption files.
5. A processor for Arabic speech processing.

[erastorgueva-nv]

Thank you! Some small comments to address

[karpnv]

LGTM

[karpnv]

please add

# Copyright (c) 2024, NVIDIA CORPORATION.  All rights reserved.
#
# 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
#
#     http://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.

[karpnv]

let's add readme.md to dataset_configs/arabic to refer to it from the paper