Schema dumps

[peterfox]

Changes In Code

Mostly the Schema Dump import and export.
Adds a test for the Schema Dump system.
There is also some fixes and documentation improvements thrown in.

Issue ticket number / Business Case

Pointed out by #27 the schema dump functionality doesn't work. This should work

Checklist before requesting a review

• I have written PHP tests.
• I have updated the documentation in the readme where needed.
• I have checked code styles, PHPStan etc. pass.
• I have provided an issue/business case.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f3383bb) 88.23% compared to head (9edb310) 91.39%.

Files	Patch %	Lines
src/CockroachDbConnection.php	92.85%	1 Missing ⚠️
src/Schema/CockroachSchemaState.php	95.23%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #30      +/-   ##
============================================
+ Coverage     88.23%   91.39%   +3.16%     
- Complexity       26       32       +6     
============================================
  Files             6        7       +1     
  Lines            68       93      +25     
============================================
+ Hits             60       85      +25     
  Misses            8        8              

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[lucacri]

Hey! I think there is an error in the way the dump is created. The statements might not end with a semicolon

missing semicolon at end of statement: insert into "migrations"

I am going to try to fork it and fix it, then send a PR