[bash_script] Add mobilenetv2/squeezenet ncnn example

[sharaelong]

Add a bash script example of object detection using mobilenetv2 and image classification using squeezenet with ncnn framework.

Self evaluation:

Build test: [X]Passed [ ]Failed [ ]Skipped Run test: [X] Passed [ ]Failed [ ]Skipped

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:octocat: cibot: @sharaelong, The last line of a text file must have a newline character. Please append a new line at the end of the line in bash_script/example_object_detection_ncnn/meson.build.

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INFO: You can read if there are misspelled characters at our misspelling check report. Please read http://ci.nnstreamer.ai/nnstreamer-example/ci/repo-workers/pr-checker/320-202312181504310.74889802932739-2e0e00cb71868a67633d5a4429642cfdccd0ce16/report/misspelling_result.txt.

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To contributor, We have used 'Signed-off-by:' notation by default to handle the license issues, that result from contributors. Note that 'Is there a Signed-off-by line?' is important because lawyers tell us we must have to it to cleanly maintain the open-source license issues even though it has nothing to do with the code itself.

[taos-ci]

:octocat: cibot: @sharaelong, The last line of a text file must have a newline character. Please append a new line at the end of the line in bash_script/example_object_detection_ncnn/meson.build.

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INFO: You can read if there are misspelled characters at our misspelling check report. Please read http://ci.nnstreamer.ai/nnstreamer-example/ci/repo-workers/pr-checker/320-202312181515320.86131000518799-4c20eefdfc63108a6a0938b5bed9e7600ee686a2/report/misspelling_result.txt.

[taos-ci]

To contributor, We have used 'Signed-off-by:' notation by default to handle the license issues, that result from contributors. Note that 'Is there a Signed-off-by line?' is important because lawyers tell us we must have to it to cleanly maintain the open-source license issues even though it has nothing to do with the code itself.

[taos-ci]

INFO: You can read if there are misspelled characters at our misspelling check report. Please read http://ci.nnstreamer.ai/nnstreamer-example/ci/repo-workers/pr-checker/320-202312181526430.9843111038208-94ee9848f0439f0a19eb5d904cd49095259e4c61/report/misspelling_result.txt.

[taos-ci]

INFO: You can read if there are misspelled characters at our misspelling check report. Please read http://ci.nnstreamer.ai/nnstreamer-example/ci/repo-workers/pr-checker/320-202312190442580.91388893127441-5f783cb15cdd3143bc70be2a441ed5aa77b89173/report/misspelling_result.txt.

[myungjoo]

Please update https://github.com/nnstreamer/nnstreamer-example/blob/main/bash_script/example_models/get-model.sh so that the corresponding model files can be downloaded automatically.

[goranmoomin]

Please update https://github.com/nnstreamer/nnstreamer-example/blob/main/bash_script/example_models/get-model.sh so that the corresponding model files can be downloaded automatically.

Done.

[goranmoomin]

We believe that with the latest commit, installing the relevant scrips and running the following examples will work without any problems.

$ get-model.sh object-detection-ncnn && gst-launch-object-detection-ncnn.sh
$ get-model.sh image-classification-ncnn && gst-launch-image-classification-ncnn.sh