dev: deduping of simple shared code

[mosteo]

Deduping of the Any_Impl remains daunting

[Copilot]

Pull request overview

This PR deduplicates small shared utilities between the Ada 2012 (yeison_12) and Ada 2022 (yeison_22) crates by moving common real-handling and JSON string quoting helpers into Yeison_Utils, and then reusing them from both crates.

Changes:

• Replaced per-crate Reals generic instantiations with a shared Yeison_Utils.Big_Reals instance (and reused Reals.Negate from that shared instance).
• Centralized JSON string quoting into Yeison_Utils.JSON_Quote and updated callers to use it.
• Removed per-crate Nicer_Image functions (now provided from Yeison_Utils via Yeison_Utils.Nicer_Image).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
yeison_22/src/yeison.ads	Switches Reals to a shared instance; removes local Nicer_Image.
yeison_22/src/yeison.adb	Uses shared Reals.Negate and Yeison_Utils.JSON_Quote instead of local helpers.
yeison_12/src/yeison_utils.ads	Adds shared JSON_Quote, adds General_Reals.Negate, and introduces shared Big_Reals instance.
yeison_12/src/yeison_12.ads	Switches Reals to a shared instance; removes local Nicer_Image.
yeison_12/src/yeison_12.adb	Uses shared Reals.Negate and Yeison_Utils.JSON_Quote instead of local helpers.

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