Bugfix/LS25000557/MOVEA from DS to S

[davidepalladino-apuliasoft]

Description

This work improves the MOVEA from DS to a S (not as number), like this snippet:

     D SCAATTDS        DS            10
     D SCAATT          S              1    DIM(10)
     ...
     C                   MOVEA     SCAATTDS      SCAATT 

Technical notes

On Jariko missed an implementation for takeFirst of DataStructValue. Finally, has been added an error (like on AS400) when the Result is a Standalone as number and not as string.

Related to #LS25000557

Checklist:

• If this feature involves RPGLE fixes or improvements, they are well-described in the summary.
• There are tests for this feature.
• RPGLE code used for tests is easily understandable and includes comments that clarify the purpose of this feature.
• The code follows Kotlin conventions (run ./gradlew ktlintCheck).
• The code passes all tests (run ./gradlew check).
• Relevant documentation is included in the docs directory.