Converted ivas_enc_cov_handler_process function and its subfunctions

[x] Converted the following functions from float to fixed:
ivas_enc_cov_handler_process
ivas_spar_get_activeW_flag
ivas_band_cov
[x] Integrated the function in SBA path.
[x] Function to be integrated in MC path in a separate MR.

EVS 26.444 BE test passes.
decoder pytests:
MLD scores:
Original inputs: 560 failed, 374 skipped
MLD > 10: 53
MLD > 5 : 124
MLD < 5 : 383
+10dB inputs: 560 failed, 374 skipped
MLD > 10: 181
MLD > 5 : 178
MLD < 5 : 201
-10dB inputs: 560 failed, 374 skipped
MLD > 10: 13
MLD > 5 : 62
MLD < 5 : 485

encoder pytests results:
MLD scores:
Original inputs: 348 failed, 212 passed, 374 skipped
MLD > 10: 28
MLD > 5 : 45
MLD < 5 : 487
+10dB inputs: 323 failed, 237 passed, 374 skipped
MLD > 10: 51
MLD > 5 : 71
MLD < 5 : 438
-10dB inputs: 331 failed, 229 passed, 374 skipped
MLD > 10: 5
MLD > 5 : 29
MLD < 5 : 526