feat: add concat & improve strip_nulls

[akoshchiy]

1. Added a builder api, which allows a json modification without the full deserialisation;
2. Added concat for Tracking: JSON functions and operators databend#11270;
3. Moved strip_nulls to the new builder;

Also, added a benchmark for comparing the strip_nulls implementations.

Results for m1 pro are:

strip_nulls_deser[./data/canada.json]
                        time:   [5.5970 ms 5.6163 ms 5.6352 ms]

strip_nulls_fast[./data/canada.json]
                        time:   [2.8134 ms 2.8249 ms 2.8363 ms]

Benchmarking strip_nulls_deser[./data/twitter.json]: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 8.8s, enable flat sampling, or reduce sample count to 50.
strip_nulls_deser[./data/twitter.json]
                        time:   [1.7488 ms 1.7705 ms 1.8024 ms]
Found 4 outliers among 100 measurements (4.00%)
  1 (1.00%) high mild
  3 (3.00%) high severe

strip_nulls_fast[./data/twitter.json]
                        time:   [812.35 µs 815.72 µs 819.60 µs]
Found 5 outliers among 100 measurements (5.00%)
  2 (2.00%) high mild
  3 (3.00%) high severe

strip_nulls_deser[./data/citm_catalog.json]
                        time:   [4.4845 ms 4.5077 ms 4.5306 ms]

strip_nulls_fast[./data/citm_catalog.json]
                        time:   [2.6602 ms 2.6698 ms 2.6797 ms]
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild

[b41sh]

LGTM
Great job on the task, builder looks very useful and we can use it for other functions
to simplify the code. Happy New Year to you by the way! @akoshchiy