Use SAR metadata in SAR calibration filters

This issue is part of the SAR sensor models refactoring story (#2142 (closed))

Rationale

SAR metadata parsing has been implemented in !761 (merged) and !707 (merged), but SAR calibration filters (SarRadiometricCalibrationToImageFilter SarBrightnessFilter) still uses metadata parsed by Ossim. These filters should be refactored to use the metadata contained in the metadata dictionary to become independent of Ossim.

Analysis

Using the metadata dictionary contained in the input image will allow some simplification of the code of these filters. They currently need to instantiate a SarImageMetadataInterface from the SarImageMetadataInterfaceFactory using the input keywordlist to retrieve the metadata. With the refactoring all required data will be contained in the image metadata.

Acceptance criterions

Verify non regression on the tests of these filters and of the SARCalibration application

Risk management

Risk	Likelihood	Impact	Action