T27 full db support

[niden]

Hello!

• Type: new feature
• Link to issue: [NFR]: Add full DB testing #27

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I have updated the relevant CHANGELOG
• I have created a PR for the documentation about this change

Phalcon\Talon\Database\Dialect, an enum resolving a PDO connection to Mysql, Pgsql, or Sqlite, with per-dialect identifier quoting.

DatabaseTrait::getDialect(), returning the connection's Dialect. Use it to choose SQL syntax; use getDriver() to tell MariaDB from MySQL.

Connection::select() now matches a NULL criterion with IS NULL instead of col = :col, which matched nothing. assertNotInDatabase('t', ['x' => null]) previously passed regardless of the data.

Connection::select() now quotes table and column identifiers per dialect, so reserved words such as order and key work.

DATA_POSTGRES_SCHEMA is now applied to the connection as SET search_path. It was previously read into the options and ignored.

Thanks

[github-actions]

Code Metrics Report

	master (18ab999)	#29 (b60f738)	+/-
Coverage	100.0%	100.0%	0.0%
Test Execution Time	2s	3s	+1s

Details

  |                     | master (18ab999) | #29 (b60f738) | +/-  |
  |---------------------|------------------|---------------|------|
  | Coverage            |           100.0% |        100.0% | 0.0% |
  |   Files             |               52 |            53 |   +1 |
  |   Lines             |              967 |           994 |  +27 |
+ |   Covered           |              967 |           994 |  +27 |
- | Test Execution Time |               2s |            3s |  +1s |

Code coverage of files in pull request scope (100.0% → 100.0%)

Files	Coverage	+/-	Status
src/Database/Connection.php	100.0%	0.0%	modified
src/Database/Dialect.php	100.0%	+100.0%	added
src/Traits/DatabaseTrait.php	100.0%	0.0%	modified

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Reported by octocov