feat: Parallel Qdrant -> Qdrant migration for improved throughput (#168)

* feat: Parallel Qdrant -> Qdrant

Signed-off-by: Anush008 <anushshetty90@gmail.com>

* Chore: Add comments to the Parallel Qdrant-Qdrant migration (#169)

* Chore: Add comments to the Parallel Qdrant-Qdrant migration

* chore: Removed some superfluos comments

Signed-off-by: Anush008 <anushshetty90@gmail.com>

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Signed-off-by: Anush008 <anushshetty90@gmail.com>
Co-authored-by: Anush008 <anushshetty90@gmail.com>

* test: Updated image_test.go

Signed-off-by: Anush008 <anushshetty90@gmail.com>

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Signed-off-by: Anush008 <anushshetty90@gmail.com>
Co-authored-by: Robert-Stam <47088745+Robert-Stam@users.noreply.github.com>

Author: Anush008

README.md

@@ -564,6 +564,12 @@ NOTE: If the target collection already exists, its vector size and dimensions mu
 | `--target.api-key`                | API key for target instance                         |
 | `--target.ensure-payload-indexes` | Ensure payload indexes exist. Default: true         |
 
+#### Additional Options
+
+| Flag                              | Description                                                    |
+| --------------------------------- | -------------------------------------------------------------- |
+| `--migration.num-workers`         | Number of parallel workers to use. Default: Number of CPU cores|
+
 See [Shared Migration Options](#shared-migration-options) for shared parameters.
 
 </details>