docs: add readme, benchmark results and reverse-direction config

Document the tool with a comprehensive README, publish benchmark results, and ship a config-reverse.yaml for the postgres to mssql direction.

config-reverse.yaml

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+max_parallel_workers: 4
+source_db_type: postgres
+target_db_type: sqlserver
+
+defaults:
+  batches_per_partition: 4
+  max_extractors: 8
+  extractor_batch_size: 25000
+  extractor_queue_size: 32
+  max_transformers: 8
+  transformer_batch_size: 50000
+  transformer_queue_size: 32
+  max_loaders: 8
+  loader_batch_size: 50000
+  partition_calculation_strategy: EXACT
+  truncate_target: true
+  truncate_method: TRUNCATE
+  retry:
+    attempts: 3
+    base_delay_ms: 500
+    max_delay_ms: 10000
+    max_jitter_ms: 500
+    max_failed_partitions: 5
+    max_failed_batches_load: 5
+
+jobs:
+  - name: demo_users_reverse
+    enabled: true
+    source:
+      schema: demo
+      table: users
+      primary_key: id
+    target:
+      schema: demo
+      table: users