Support for Second-band Channel Adjustments in INT-CAL HDF5

[rad-eng-59]

This PR adds support for the TX/RX channel adjustment factors of the second frequency band (aka B) in instrument INT-CAL HDF5.
The EAP of RSLC workflow utilizes this feature simply for split-spectrum case where the second frequency band requires different adjustment than the first one (aka A) on either of TX/RX side for both polarization H/V due to relatively large separation between two frequency bands. This is necessary to account properly for frequency-dependency of the instrument in particular on band-limited RX side!

This PR adds the following features:

• Add a new dataset to instrument INT-CAL HDF5 for the TX/RX complex fudge factors of second frequency band, called amplitudeB.
• Update the instrument parser to read newly added dataset if available. If not, it will use the values for the primary band (backward compatible from the perspective of both ISCE3 python API and product version)
• Bump the INT-CAL product version to v3.0 and provided sample product for testing.
• EAP module pattern.py now uses this new feature per frequency band if available for only the second band of split spectrum case (SSP).