The second usage of metadata

[tristaZero]

Fixes #758 .

Changes proposed in this pull request:

• Support insert without columns.
• Support insert without columns and generating generated-key.
• Add some tests and expected files for this usage.
• Modify some tests.

[codecov-io]

Codecov Report

Merging #771 into dev will increase coverage by 0.2%.
The diff coverage is 97.01%.

@@            Coverage Diff            @@
##              dev     #771     +/-   ##
=========================================
+ Coverage   64.28%   64.49%   +0.2%     
=========================================
  Files         483      484      +1     
  Lines        9506     9547     +41     
  Branches     1562     1571      +9     
=========================================
+ Hits         6111     6157     +46     
+ Misses       3060     3053      -7     
- Partials      335      337      +2

Impacted Files	Coverage Δ
...dingjdbc/core/parsing/parser/token/ItemsToken.java	66.66% <ø> (ø)	⬆️
...ingjdbc/core/parsing/parser/token/SymbolToken.java	0% <0%> (ø)
.../parser/dialect/oracle/sql/OracleInsertParser.java	100% <100%> (ø)	⬆️
...ng/parser/dialect/mysql/sql/MySQLInsertParser.java	100% <100%> (ø)	⬆️
...r/dialect/sqlserver/sql/SQLServerInsertParser.java	100% <100%> (ø)	⬆️
...rsing/parser/clause/InsertColumnsClauseParser.java	96.87% <100%> (+2.75%)	⬆️
...ng/parser/sql/dml/insert/AbstractInsertParser.java	90.9% <100%> (+0.9%)	⬆️
...parsing/parser/sql/dml/insert/InsertStatement.java	62.5% <100%> (+22.5%)	⬆️
...ing/parser/sql/dml/insert/InsertParserFactory.java	83.33% <100%> (ø)	⬆️
...dialect/postgresql/sql/PostgreSQLInsertParser.java	100% <100%> (ø)	⬆️
... and 9 more

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