feat(query): add time_zone param

[aniaan]

The time_zone parameter is very important for users in non-UTC time zones. We need to add this parameter to adapt to different time zones.

This parameter affects the processing of the time function in the ES-SQL query.

https://www.elastic.co/guide/en/elasticsearch/reference/current/sql-search-api.html

eg:
To demonstrate the role of time_zone, the DATETIME_PARSE function is used, butDATETIME_PARSE can only be used after ES 7.8, so the ES_SUPPORT_DATETIME_PARSE parameter is added to the env

[codecov-commenter]

Codecov Report

Merging #69 (4cf73f2) into master (ea7a093) will increase coverage by 0.13%.
The diff coverage is 100.00%.

❗ Current head 4cf73f2 differs from pull request most recent head de19337. Consider uploading reports for the commit de19337 to get more accurate results

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   94.52%   94.66%   +0.13%     
==========================================
  Files          15       15              
  Lines         932      956      +24     
==========================================
+ Hits          881      905      +24     
  Misses         51       51              

Flag	Coverage Δ
python	94.66% <100.00%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
es/elastic/api.py	87.23% <ø> (ø)
es/opendistro/api.py	96.18% <ø> (ø)
es/baseapi.py	90.44% <100.00%> (+0.18%)	⬆️
es/tests/test_dbapi.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ea7a093...de19337. Read the comment docs.

[dpgaspar]

Looks good, can you document this new parameter here: https://github.com/preset-io/elasticsearch-dbapi#connection-parameters

related Superset issue: apache/superset#16726

[aniaan]

Looks good, can you document this new parameter here: https://github.com/preset-io/elasticsearch-dbapi#connection-parameters

related Superset issue: apache/superset#16726

The documentation has been updated, please review