feat: readBytes to return Bytes.EMPTY for zero length

[anthony-swirldslabs]

Description:
DirectBufferedData.readBytes() should return Bytes.EMPTY instead of creating new zero-length Bytes objects when the length is zero.

Related issue(s):

Fixes #291

Notes for reviewer:
A new unit test is added to verify the behavior.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[github-actions]

JUnit Test Report

   78 files  ±0     78 suites  ±0   4m 4s ⏱️ +5s
1 350 tests +3  1 346 ✅ +3   4 💤 ±0  0 ❌ ±0 
7 227 runs  +3  7 207 ✅ +3  20 💤 ±0  0 ❌ ±0 

Results for commit d040965. ± Comparison against base commit c2f6bdf.

This pull request removes 8 and adds 10 tests. Note that renamed tests count towards both.

, 1
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [1] FLOAT, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c042f5a8@32068aef, [0.1, 0.5, 100.0], 12, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c042f7b8@8ab231
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [1] STRING, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c043e630@394e504d, [string 1, testing here, testing there], com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c043e840@62ff14cd
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [2] BYTES, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c043ea50@426a4301, [010203, ff7f0f, 42da07370bff], com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c043ec60@193f3306
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [2] DOUBLE, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c042f9c8@16024b49, [0.1, 0.5, 100.0, 1.7653472635472653E240], 32, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c042fbd8@53f94afe
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [3] BOOL, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c042fde8@7d4e424e, [true, false, false, true, true, true], 6, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0434000@799206ad
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [4] ENUM, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0434210@2059c3ff, [Mock for EnumWithProtoMetadata, hashCode: 1811787479, Mock for EnumWithProtoMetadata, hashCode: 1794960787, Mock for EnumWithProtoMetadata, hashCode: 1058287239], 3, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0434420@2b30b627
com.hedera.pbj.runtime.Utf8ToolsTest ‑ [4] 

com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [1] FLOAT, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0449b38@6ba0dcba, [0.1, 0.5, 100.0], 12, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0449d48@6d7772d3
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [1] STRING, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0456a58@32e9c3af, [string 1, testing here, testing there], com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0456c68@796e2187
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [2] BYTES, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0456e78@31aa9b01, [010203, ff7f0f, 42da07370bff], com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0457088@2148b47e
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [2] DOUBLE, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c0449f58@7d4e424e, [0.1, 0.5, 100.0, 1.7653472635472653E240], 32, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c044a168@799206ad
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [3] BOOL, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c044a378@2059c3ff, [true, false, false, true, true, true], 6, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c044a588@2f8ab988
com.hedera.pbj.runtime.ProtoWriterToolsTest ‑ [4] ENUM, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c044a798@e47637c, [Mock for EnumWithProtoMetadata, hashCode: 1890388052, Mock for EnumWithProtoMetadata, hashCode: 1673971173, Mock for EnumWithProtoMetadata, hashCode: 1859857531], 3, com.hedera.pbj.runtime.ProtoWriterToolsTest$$Lambda/0x00000007c044a9a8@684430c1
com.hedera.pbj.runtime.Utf8ToolsTest ‑ [4] 
, 1
com.hedera.pbj.runtime.io.buffer.BufferedDataTest ‑ readBytesReturnsConstantEmptyForZeroLength()
com.hedera.pbj.runtime.io.buffer.ByteArrayBufferedDataTest ‑ readBytesReturnsConstantEmptyForZeroLength()
com.hedera.pbj.runtime.io.buffer.DirectBufferedDataTest ‑ readBytesReturnsConstantEmptyForZeroLength()

[github-actions]

Integration Test Report

    409 files  ±0      409 suites  ±0   16m 25s ⏱️ +15s
114 853 tests ±0  114 853 ✅ ±0  0 💤 ±0  0 ❌ ±0 
115 094 runs  ±0  115 094 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit d040965. ± Comparison against base commit c2f6bdf.

This pull request removes 3 and adds 3 tests. Note that renamed tests count towards both.

com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [1] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007f92b0bc4000@59621804
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [2] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007f92b0bc4230@589f936c
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [3] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007f92b0bc4460@3d657ebd

com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [1] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007fcf17bbd518@15dbf6f4
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [2] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007fcf17bbd748@493b2893
com.hedera.pbj.integration.test.ParserNeverWrapsTest ‑ [3] com.hedera.pbj.integration.test.ParserNeverWrapsTest$$Lambda/0x00007fcf17bbd978@60e56cf9