[DOP-8140] Split Clickhouse and Clickhouse.Dialect to separated submodules

[dolfinus]

Change Summary

• Split Clickhouse and Clickhouse.Dialect to submodules. Same for MSSQL, MySQL, Oracle, Postgres, Teradata.
• Move methods of generating aliases for partitioningMode="hash" and "mod" from ReadOptions to Dialect. Because of this, connection-related classes ReadOptions and Options are not required anymore, all JDBC connection uses the same JDBCOptions and JDBCLegacyOptions.
• Split documentation for each connection to different pages with following themes (see https://onetl--133.org.readthedocs.build/en/133/connection/db_connection/clickhouse/index.html):
• • base connection documentation (constructor, get_packages, check)
• • reading from database (DBReader and .sql with JDBCReadOptions)
• • writing to database (DBWriter with JDBCWriteOptions)
• • executing statements in database (.fetch and .execute with JDBCOptions)
• Added tests for partitioningMode="range" with unset lowerBound/upperBound, discovered and fixed bug in Oracle dialect - expression MAX(column) AS max was returned as dataframe column with name MAX instead of max.

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

Merging #133 (721d804) into develop (ae4b5c9) will increase coverage by 0.07%.
The diff coverage is 94.90%.

@@             Coverage Diff             @@
##           develop     #133      +/-   ##
===========================================
+ Coverage    94.22%   94.29%   +0.07%     
===========================================
  Files          195      207      +12     
  Lines         7684     7697      +13     
  Branches      1450     1451       +1     
===========================================
+ Hits          7240     7258      +18     
+ Misses         324      320       -4     
+ Partials       120      119       -1     

Files Changed	Coverage Δ
...l/connection/db_connection/greenplum/connection.py	70.38% <ø> (ø)
onetl/connection/db_connection/hive/connection.py	90.79% <ø> (ø)
onetl/connection/db_connection/hive/dialect.py	85.71% <66.66%> (-14.29%)	⬇️
onetl/connection/db_connection/teradata/dialect.py	66.66% <66.66%> (ø)
onetl/connection/db_connection/oracle/dialect.py	88.88% <88.88%> (ø)
...netl/connection/db_connection/oracle/connection.py	86.18% <90.90%> (ø)
...tl/connection/db_connection/clickhouse/__init__.py	100.00% <100.00%> (ø)
.../connection/db_connection/clickhouse/connection.py	100.00% <100.00%> (ø)
...etl/connection/db_connection/clickhouse/dialect.py	100.00% <100.00%> (ø)
.../connection/db_connection/db_connection/dialect.py	100.00% <100.00%> (ø)
... and 15 more