TimeSeries - Insertion-filter for close samples

[atakavci]

support for IGNORE option values in time difference and value difference,
related commands CREATE, ALTER, ADD, INCRBY, DECRBY

TS.CREATE … IGNORE <ignore_max_time_diff> <ignore_max_val_diff>
TS.ALTER … IGNORE <ignore_max_time_diff> <ignore_max_val_diff>
TS.ADD … IGNORE <ignore_max_time_diff> <ignore_max_val_diff>
TS.INCRBY ... IGNORE <ignore_max_time_diff> <ignore_max_val_diff>
TS.DECRBY ... IGNORE <ignore_max_time_diff> <ignore_max_val_diff>

for more details: here