DOC-5471 time series doc examples (#4210)

* DOC-5471 time series doc examples

* DOC-5471 added REMOVE section around initial key deletions

* DOC-5471 added TSElement import to fix CI errors

* DOC-5471 replaced Map.entry with AbstractMap.SimpleEntry<> for compatibility

* DOC-5471 fixed a few remaining instances of Map.entry

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Co-authored-by: Ivo Gaydazhiev <ivo.gaydazhiev@redis.com>

Author: andy-stark-redis