DATASOURCE-1683: add example datasource demo

[BohuTANG]

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Summary

This PR including:

• [x] introduce a new datasource example
• [x] low the database and table engine check to Catalog, it's easy to add new
• [x] doc how to add a new datasource

Changelog

• Improvement

Related Issues

Fixes #1683

Test Plan

Unit Tests

Stateless Tests

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[codecov-commenter]

Codecov Report

Merging #1691 (b4f3851) into master (f0fa13a) will increase coverage by 0%. The diff coverage is 95%.

@@          Coverage Diff           @@
##           master   #1691   +/-   ##
======================================
  Coverage      72%     72%           
======================================
  Files         576     577    +1     
  Lines       33880   33940   +60     
======================================
+ Hits        24464   24536   +72     
+ Misses       9416    9404   -12     

Impacted Files	Coverage Δ
query/src/catalogs/impls/database_catalog.rs	78% <37%> (-6%)	:arrow_down:
query/src/sql/sql_parser.rs	76% <83%> (-1%)	:arrow_down:
query/src/sql/sql_parser_test.rs	93% <97%> (+<1%)	:arrow_up:
common/planners/src/plan_database_create.rs	88% <100%> (+1%)	:arrow_up:
common/planners/src/plan_display_test.rs	93% <100%> (+<1%)	:arrow_up:
common/planners/src/plan_table_create.rs	90% <100%> (+14%)	:arrow_up:
query/src/datasources/local/local_meta_backend.rs	81% <100%> (+3%)	:arrow_up:
query/src/datasources/tests.rs	96% <100%> (ø)
query/src/sql/plan_parser.rs	74% <100%> (-1%)	:arrow_down:
query/src/sql/sql_statement.rs	75% <100%> (ø)
... and 16 more

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