UpdateBody type is not usably exported for some use cases

[dls314]

Hi,

When trying to use the UpdateBody type (from https://github.com/typedorm/typedorm/blob/main/packages/core/src/classes/expression/update-body-type.ts#L98-L112) in a TS project with tsconfig settings that include

    "module": "node16",
    "moduleResolution": "node16",

I get seemingly unresolvable import errors because those module and moduleResolution types imply the resolvePackagejsonExports (https://www.typescriptlang.org/tsconfig#resolvePackageJsonExports) which seems not to allow a submodule import like the following

import { UpdateBody } from '@typedorm/core/esm/src/classes/expression/update-body-type';

The submodule import being necessary, because the UpdateBody type is not included in the public or private API exports from TypeDorm, even though it's referenced by the EntityManager public API.