fix(Filter): keep track of active filters

[vko-online]

Problem: filters stored as objects, they override each other every time 1 filter changes
Solution: Keep track of every filter separate, using single uniq key identifier

task: #1021

[teosarca]

Did a quick test but now nothing happens when i press apply (i.e. nothing sent to backend):

[vko-online]

@teosarca Yes, sorry, my bad, now i've reverted the initial state value. Works as expected now

[metasnw]

after testing the filters are applied but are not displayed correctly.
@teosarca shall we close the PR ?

[teosarca]

@metasnw yup. basically the frontend was sending the right filters to backend but after that, in UI, the filters were cleared and just the last one used was kept.