fix: composableFilterOption deserialization fixed

[mehmetaligok]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Need Doc update	no

Describe your change

composableFilterOption deserialization fixed to handle mixed cases. Also, deserialization logic is fixed to take the first level as separate and group. With the changes deserialization handles the following cases;

["color:green","color:yellow"] => [["color:green"],["color:yellow"]]

[["color:green","color:yellow"], "color:blue"] => [["color:green","color:yellow"], ["color:blue"]]

Other client library PRs that fix related issues are based. Ex: algolia/algoliasearch-client-java#771

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PS: When fixing this issue, we noticed that legacy one string parsing is also not handled properly in this client. It will be addressed with another PR.

[sbellone]

Looks great, thanks for tackling it!