Acknowledgements
SD thanks partial financial support from DST (IFA12-CH-76,
CRG/2019/002891), seed grant from CUSAT for new research initiative and
UGC-SAP, DST-PURSE grant at CUSAT. The computer center at CUSAT is also
acknowledged for providing the computational facility set up using the
DST-PURSE fund. MSNK thanks CUSAT for research fellowship.