feat(Modbus): add ReadInputsAsync function

[ArgoZhang]

Link issues

fixes #9

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

[Copilot]

Pull Request Overview

This PR adds the ReadInputsAsync function to the Modbus library, implementing support for reading discrete inputs (function code 0x02) from Modbus TCP slaves. The implementation refactors the existing Modbus client code to support multiple read operations through a shared private method.

• Implements ReadInputsAsync method for reading discrete inputs (FC2)
• Refactors existing ReadCoilsAsync implementation to use shared validation and parsing logic
• Makes factory method parameters optional for better usability

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Longbow.Modbus/IModbusTcpClient.cs	Updates interface to add ReadInputsAsync method and improve documentation
src/Longbow.Modbus/DefaultModbusTcpClient.cs	Implements ReadInputsAsync with shared validation logic and refactors existing code
src/Longbow.Modbus/IModbusFactory.cs	Makes factory method parameters optional
src/Longbow.Modbus/DefaultModbusFactory.cs	Updates factory implementation to handle optional parameters
src/Longbow.Modbus/ModbusMessageBuilder.cs	Changes return type from byte[] to ReadOnlyMemory<byte>
test/UnitTestModbus/TcpClientTest.cs	Adds unit test for new ReadInputsAsync functionality
test/UnitTestSocket/TcpSocketFactoryTest.cs	Updates service registration calls
test/UnitTestSocket/DefaultSocketClientProviderTest.cs	Updates service registration calls
src/Longbow.TcpSocket/Longbow.TcpSocket.csproj	Version bump to 9.0.1
src/Longbow.Socket/Longbow.Socket.csproj	Version bump to 9.0.1

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