pick up parallel read for s3

[TingDaoK]

• pick up Parallel prepare - open file on needed aws-c-s3#355
• which increase the performance for uploading a single large file on EC2 machines
• By using our benchmark we have here, we verify that with this change on a cold started (Without file caching by OS) c5n.18xlarge machine, running a 30GiB file upload, the result is:

> java -jar /home/ec2-user/fast_ebs/aws-crt-s3-benchmarks/runners/s3-benchrunner-crt-java/target/s3-benchrunner-crt-java-1.0-SNAPSHOT.jar ../benchmarks/upload-30GiB.run.json test-s3-benchmark us-west-2 100.0
Run:1 Secs:31.788 Gb/s:8.1 Mb/s:8106.8 GiB/s:0.9 MiB/s:966.4
Run:2 Secs:10.323 Gb/s:25.0 Mb/s:24964.1 GiB/s:2.9 MiB/s:2976.0
Run:3 Secs:8.218 Gb/s:31.4 Mb/s:31356.4 GiB/s:3.7 MiB/s:3738.0
Run:4 Secs:8.797 Gb/s:29.3 Mb/s:29295.1 GiB/s:3.4 MiB/s:3492.3
Run:5 Secs:8.557 Gb/s:30.1 Mb/s:30113.8 GiB/s:3.5 MiB/s:3589.8
Run:6 Secs:7.567 Gb/s:34.1 Mb/s:34054.2 GiB/s:4.0 MiB/s:4059.6
Run:7 Secs:10.173 Gb/s:25.3 Mb/s:25331.2 GiB/s:2.9 MiB/s:3019.7
Run:8 Secs:9.897 Gb/s:26.0 Mb/s:26039.2 GiB/s:3.0 MiB/s:3104.1
Run:9 Secs:9.621 Gb/s:26.8 Mb/s:26784.5 GiB/s:3.1 MiB/s:3193.0
Run:10 Secs:10.150 Gb/s:25.4 Mb/s:25390.0 GiB/s:3.0 MiB/s:3026.7

• while from main branch, the same test has the result as:

> java -jar /home/ec2-user/fast_ebs/aws-crt-s3-benchmarks/runners/s3-benchrunner-crt-java/target/s3-benchrunner-crt-java-1.0-SNAPSHOT.jar ../benchmarks/upload-30GiB.run.json test-s3-benchmark us-west-2 100.0
Run:1 Secs:105.977 Gb/s:2.4 Mb/s:2431.6 GiB/s:0.3 MiB/s:289.9
Run:2 Secs:13.957 Gb/s:18.5 Mb/s:18463.8 GiB/s:2.1 MiB/s:2201.1
Run:3 Secs:14.776 Gb/s:17.4 Mb/s:17439.8 GiB/s:2.0 MiB/s:2079.0
Run:4 Secs:16.043 Gb/s:16.1 Mb/s:16062.7 GiB/s:1.9 MiB/s:1914.8
Run:5 Secs:14.829 Gb/s:17.4 Mb/s:17377.9 GiB/s:2.0 MiB/s:2071.6
Run:6 Secs:14.789 Gb/s:17.4 Mb/s:17424.8 GiB/s:2.0 MiB/s:2077.2
Run:7 Secs:16.562 Gb/s:15.6 Mb/s:15559.9 GiB/s:1.8 MiB/s:1854.9
Run:8 Secs:13.211 Gb/s:19.5 Mb/s:19505.7 GiB/s:2.3 MiB/s:2325.3
Run:9 Secs:13.331 Gb/s:19.3 Mb/s:19330.5 GiB/s:2.3 MiB/s:2304.4
Run:10 Secs:12.489 Gb/s:20.6 Mb/s:20633.3 GiB/s:2.4 MiB/s:2459.7

We can see a significant improve on every run.

• From the first run without any caching, we saw the performance improved from 2.4 Gb/s to 8.1 Gb/s, which is the limits of EBS
• From the following runs, as the file cached by OS, we saw improvement from 16~20 Gb/s to 25~34 Gb/s.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.