WIP: Add SQL array type support in createEntity

[aliendrew]

Closes: #275

• tests and linter show no problems (npm t)
• tests are added/updated for bug fixes and new features
• code is properly formatted (npm run fmt)
• description of changes is added in CHANGELOG.md
• update .d.ts typings

[tshemsedinov]

It looks like here is not only type support but also some refactoring.

[aliendrew]

Regarding refactoring, I only changed

if (ignoreField(name, field, def)) continue;

to

if (ignoreField(name, field, def) || !def.type) continue;

to avoid unnecessary nesting inside a for loop with if (def.type) condition that included the rest of the code.
That's why diff shows deletions and insertions of the same code snippets.

Also, I did

const maxLength = def.length?.max;

because we need that maxLength not only when adding length to a generic type but also when particularly dealing with an array type.

[tshemsedinov]

As of now we have unacceptable long diff for such a change. I will refactor initial code then you can rebase on master branch and update solution. Renaming to WIP (work in progress) and I'll inform you to continue. Thanks for patience.

[tshemsedinov]

Also, in future, it would be way to add types without changing js codebase. See metaschema, we need to extract all metadata from types and use custom types described in schemas.

[aliendrew]

Got it.