io.openems.edge.bridge.modbus.ascii - adding support for Modbus/ASCII over serial

[janklostermann]

This PR adds a Modbus/ASCII bridge to openems to support devices that communicate through this protocol via a serial port (one example would be the ABL eMH1).

It is implemented as a separate component to not interfere with the existing modbus bridge, which implements the Modbus/RTU protocol over serial under the name BridgeModbusSerialImpl.java.

It might be a good idea to integrate this code into the io.openems.edge.bridge.modbus component. There could be even an abstraction be made to separate-out common code for the serial RTU and ASCII implementations (both use j2mod for the heavy-lifting) and rename the current Serial to SerialRtu.
If you wish I can adjust this PR accordingly.
(I chose the path of separating them to simplify evaluation and merging, and avoid the risk of mixing things up in the field-proven modbus bridge.)

Unfortunatetely I was not able to bring this component into the section device interfaces alongside the other bridges. I would be happy to fix this if I knew how.

[codecov]

Codecov Report

❌ Patch coverage is 52.33161% with 92 lines in your changes missing coverage. Please review.

❌ Your patch check has failed because the patch coverage (52.34%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3632      +/-   ##
=============================================
+ Coverage      58.52%   58.56%   +0.05%     
  Complexity       104      104              
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  Files           3095     3099       +4     
  Lines         134205   134398     +193     
  Branches        9870     9881      +11     
=============================================
+ Hits           78528    78695     +167     
- Misses         52761    52774      +13     
- Partials        2916     2929      +13     

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[janklostermann]

Sorry, cbd5948 was definitely premature. I am going to fix the issues and integrate some further improvements of the PR. I will come back soon.