feat: export interfaces from schema-builder/options

[navarroaxel]

Description of change

Export options interfaces from 'src/schema-builder/options', making them
usable in migrations, e.g.:

import { TableColumnOptions } from 'typeorm';

This fix a type error when you use:

const columnOptions = {
   name: 'uuid',
  type: 'uuid',
  isGenerated: true,
  generationStrategy: 'uuid',
  default: 'uuid_generate_v4()',
  isNullable: false,
  isUnique: true,
};
await queryRunner.addColumn('Users', columnOptions);

TS2345: Argument of type '{ name: string; type: string; isGenerated: boolean; generationStrategy: string; default: string; isNullable: boolean; isUnique: boolean; }' is not assignable to parameter of type 'TableColumnOptions'.   Types of property 'generationStrategy' are incompatible.     Type 'string' is not assignable to type '"uuid" | "increment" | "rowid" | "identity"'

TypeScript v4.4 / v4.5.

Pull-Request Checklist

• Code is up-to-date with the master branch
• npm run lint passes with this change
• npm run test passes with this change
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change
• Documentation has been updated to reflect this change
• The new commits follow conventions explained in CONTRIBUTING.md