QueryExpressionMap doesn't clone all values correctly

[pippinthegreat]

Issue type:

[x] bug report

Database system/driver:

[x] postgres

TypeORM version:

[x] 0.2.17 (or put your version here)

Steps to reproduce or a small repository showing the problem:

QueryExpressionMap's clone method doesn't clone all values correctly, specifically insertColumns, whereEntities, and nativeParameters are currently cloned by reference. The persistent reference to nativeParameters between clones causes issues with postgres as it generates the wrong parameter names ($1, $2, $3...) in QueryBuilder.computeWhereParameter()

...
const qb = connection.manager
  .createQueryBuilder("Post", "post");

await Promise.all([
  qb.clone().where({ id: 1 }).getOne(),
  qb.clone().where({ id: 1 }).getOne(),
]);

// postgres error - "could not determine data type of parameter $1"

I'm opening this issue so I can reference it in a PR that fixes this bug