RATIS-2546. Add input stream to DataStreamApi for read operations in Client

[peterxcli]

What changes were proposed in this pull request?

• Added a new DataStreamInput interface and its implementation DataStreamInputImpl for asynchronous, zero-copy read-only data streaming, including the readAsync() method for consuming replies and proper resource release on close.
• Extended the DataStreamApi interface and its implementation to provide streamReadOnly() methods for creating read-only streams.
• Introduced the new DataStreamReplyByteBuf class to support replies backed by Netty ByteBuf.
• Added a new overload of streamAsync() in the DataStreamClientRpc interface that takes a reply consumer, supporting multiple replies per request.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/RATIS-2546

How was this patch tested?

(Please explain how this patch was tested. Ex: unit tests, manual tests)
(If this patch involves UI changes, please attach a screen-shot; otherwise, remove this)

[peterxcli]

cc @szetszwo

[peterxcli]

The no-MD5 sequential reads comparison:

Key size	Buffer	ReadBlock stream	Ratis data stream	Ratis / ReadBlock bandwidth
256 MiB	32 MiB	333.23 MB/s	448.04 MB/s	1.34x bandwidth
256 MiB	8 MiB	651.57 MB/s	753.94 MB/s	1.16x bandwidth
256 MiB	1 MiB	346.72 MB/s	726.91 MB/s	2.10x bandwidth
256 MiB	4 KiB	303.35 MB/s	777.43 MB/s	2.56x bandwidth
500 MiB	32 MiB	731.13 MB/s	445.67 MB/s	0.61x bandwidth
500 MiB	8 MiB	587.45 MB/s	1012.59 MB/s	1.72x bandwidth
500 MiB	1 MiB	520.76 MB/s	598.70 MB/s	1.15x bandwidth
500 MiB	4 KiB	373.36 MB/s	846.50 MB/s	2.27x bandwidth
1 GiB	32 MiB	869.43 MB/s	693.04 MB/s	0.80x bandwidth
1 GiB	8 MiB	508.69 MB/s	474.92 MB/s	0.93x bandwidth
1 GiB	1 MiB	432.13 MB/s	784.25 MB/s	1.81x bandwidth
1 GiB	4 KiB	378.85 MB/s	1087.56 MB/s	2.87x bandwidth

The no-MD5 random reads comparison:

Key size	Random read size	Direct stream	Ratis data stream	Bandwidth ratio	IOPS ratio	Direct elapsed	Ratis elapsed
256 MiB	1 MiB	28.92 MB/s	103.03 MB/s	3.56x bandwidth	3.56x IOPS	1.106 s	0.311 s
256 MiB	4 KiB	0.12 MB/s	0.38 MB/s	3.19x bandwidth	3.19x IOPS	1.059 s	0.332 s
500 MiB	1 MiB	44.18 MB/s	255.86 MB/s	5.79x bandwidth	5.79x IOPS	0.724 s	0.125 s
500 MiB	4 KiB	0.14 MB/s	0.59 MB/s	4.06x bandwidth	4.06x IOPS	0.865 s	0.213 s
1 GiB	1 MiB	33.08 MB/s	193.64 MB/s	5.85x bandwidth	5.85x IOPS	0.967 s	0.165 s
1 GiB	4 KiB	0.10 MB/s	0.87 MB/s	8.34x bandwidth	8.34x IOPS	1.197 s	0.144 s

I'm looking into why larger buffer would cause throughput to degrade.