🐛 [BUGFIX] For SAPRFCV2 adding whitespaces to match sub - queries

[marcinpurtak]

Summary

Seems like SAP returns columns with different amount of whitespaces - ideally SAP server should always add whitespaces , that the amount of characters matches the declared data type in SAP table definition.
However, after some investigation , looks like from every n-th SAP request, it is trimming all whitespaces or messing the number of added ones - which could lead to wrongly merged SAP responses using unique columns as the merge key.

In this PR there is a solution, that, for each UNIQUE columns, checks the returned SAP table metadata to obtain what is the declared data type ( and the characters amount ) , then it checks what is the received character amount and adds whitespaces to match the declared one.

Whitespaces are added using vector/matrix approach which doesn't slow down the ingestion process ( not a huge impact on performance).

This PR closes #556

Importance

Important because missing whitespaces could lead to problems with joining sub - queries based on the unique columns

Checklist

This PR:

• follows the guidelines laid out in CONTRIBUTING.md
• links relevant issue(s)
• adds/updates tests (if appropriate)
• adds/updates docstrings (if appropriate)
• adds an entry in CHANGELOG.md

[m-paz]

hi @trymzet
It's a bugfix, there is a milestone for 2025 to refactor the whole connector but as of now we need to continue with this one.

Thanks!

[trymzet]

Added feedback, can you pls also add at least 1 unit test for this?