[CH] Unsupported spark function list [please leave a comment if you plan to pick some]

### Description

Here listed spark functions still not supported by Gluten CH backend. Please leave a comment if you'd like to pick some. In the below list, [√] means someone is working in progress for the corresponding function.

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- [x] https://github.com/apache/incubator-gluten/issues/6816
- [x] https://github.com/apache/incubator-gluten/issues/7100
- [ ] https://github.com/apache/incubator-gluten/issues/6815
- [ ] https://github.com/apache/incubator-gluten/issues/6814
- [x] https://github.com/apache/incubator-gluten/issues/6813
- [ ] https://github.com/apache/incubator-gluten/issues/6812
- [ ] https://github.com/apache/incubator-gluten/issues/6811
- [x] https://github.com/apache/incubator-gluten/issues/6810
- [x] https://github.com/apache/incubator-gluten/issues/6809
- [x] https://github.com/apache/incubator-gluten/issues/6808
- [ ] https://github.com/apache/incubator-gluten/issues/6807
- [x] https://github.com/apache/incubator-gluten/issues/6806
- [x] https://github.com/apache/incubator-gluten/issues/6805
- [ ] https://github.com/apache/incubator-gluten/issues/4945
- [x] https://github.com/apache/incubator-gluten/issues/4730
- [ ] Kurtosis
- [ ] UnixMillis
- [ ] UnixMicros
- [ ] MillisToTimestamp
- [ ] MicrosToTimestamp
- [ ] Stack
- [x] #8080
- [x] #8081
- [ ] max_by/min_by
- [ ] array_append
- [ ] array_insert
- [ ] mode
- [ ] randn
- [ ] expm1
- [ ] cot
- [ ] levenshtein
- [ ] format_number
- [ ] format_string
- [ ] shuffle
- [ ] bool_and/every
- [ ] bool_or/any/some
- [ ] count_min_sketch
- [ ] initcap
- [ ] xpath
- [ ] xpath_boolean
- [ ] xpath_double
- [ ] xpath_float
- [ ] xpath_int
- [ ] xpath_long
- [ ] xpath_number
- [ ] xpath_short
- [ ] xpath_string
- [ ] width_bucket
- [ ] flatten
- [ ] forall
- [ ] map_concat
- [ ] map_entries
- [ ] map_filter
- [ ] map_from_entries
- [ ] date_part
- [ ] extract
- [ ] monotonically_increasing_id
- [ ] exists
- [ ] make_interval
- [ ] make_dt_interval
- [ ] make_timestamp
- [ ] make_ym_interval
- [ ] to_csv
- [ ] schema_of_json
- [ ] schema_of_csv
- [ ] json_tuple
- [ ] json_object_keys
- [ ] to_json
- [ ] from_json
- [ ] from_csv
- [ ] inline
- [ ] inline_outer