TFLM swapping TfLiteRegistration_V1 struct to a new more embedded friendly api in the TFLMRegistration struct (#2001)

BUG=http://b/279811848

Gets rid of all references/usage of AllOpsResolver in the TFLM repo

[corresponding google3 cl](https://critique.corp.google.com/cl/528512732)

BUG=[b/280326818](https://b.corp.google.com/issues/280326818)

Change generated with the following command:
```bash
cd tensorflow/lite/micro/
sed -i 's/TfLiteRegistration/TfLiteRegistration_V1/g' `find . -name "*.h" -o -name "*.cc"`
cd -
cd third_party/hexagon/
sed -i 's/TfLiteRegistration/TfLiteRegistration_V1/g' `find . -name "*.h" -o -name "*.cc"`
cd -
tensorflow/lite/micro/tools/ci_build/test_code_style.sh --fix_formatting
```

BUG=http://b/272808609

@tensorflow/micro

Flatten namespace for kernel operator MAXIMUM, MINIMUM
Update unit tests namespace usage
Update MicroOpResolver namespace usage

bug=fixes #1701

Confirmed that the following command passes:
```
./tensorflow/lite/micro/tools/ci_build/test_all_new.sh GITHUB_PRESUBMIT
```