[postgres] Reimplement PostgresDriver using deno-postgres

[uki00a]

https://github.com/denolib/typeorm/runs/928947102

Tasks

• [x] Add basic implementation (#20)

• [ ] Enable PostgresDriver in CI (49abf4d74840316651e78278b8fe557045b59bf2)

• [ ] Implement missing features and fix failing tests

  • [ ] Add support for cube
    • https://github.com/denolib/typeorm/blob/master/test/functional/cube/postgres/cube-postgres.ts
  • [ ] Add support for enum array
    • https://github.com/denolib/typeorm/blob/master/test/functional/database-schema/enums-array/enums-array.ts
  • [x] Add support for array types (may be resolved at #85)
    • https://github.com/denolib/typeorm/blob/master/test/github-issues/1600/issue-1600.ts
  • [ ] Add support for enum types
    • https://github.com/denolib/typeorm/blob/master/test/functional/database-schema/column-types/postgres-enum/postgres-enum.ts
    • https://github.com/denolib/typeorm/blob/master/test/functional/database-schema/enums/enums.ts
    • https://github.com/denolib/typeorm/blob/master/test/functional/database-schema/simple-enums/enums.ts
    • https://github.com/denolib/typeorm/blob/master/test/github-issues/1997/issue-1997.ts
    • https://github.com/denolib/typeorm/blob/master/test/github-issues/2871/issue-2871.ts
    • https://github.com/denolib/typeorm/blob/master/test/github-issues/4106/issue-4106.ts
    • https://github.com/denolib/typeorm/blob/master/test/github-issues/4630/issue-4630.ts
  • [ ] Add support for hstore
    • https://github.com/denolib/typeorm/blob/master/test/github-issues/922/issue-922.ts
    • https://github.com/denolib/typeorm/blob/master/test/github-issues/4719/issue-4719.ts
  • [ ] Fix increment issue
    • https://github.com/denolib/typeorm/blob/master/test/other-issues/ekifox-increment-issue/ekifox-increment-issue.ts
  • [x] Improve compatibility with the original typeorm (#57)

• https://github.com/denolib/typeorm/blob/49abf4d74840316651e78278b8fe557045b59bf2/src/driver/postgres/PostgresQueryRunner.ts#L210-L219

[u-ways]

Hello, can you add the hacktoberfest label please?