Enhance ParseQuantityError to Include Suggested Values for Improved User Feedback

[naronchen]

Feature Request: Enhance ParseQuantityError to Include Suggested Values

Problem Description
The current implementation of parseQuantityString in the Parser returns a ParseQuantityError with the following structure:

export interface ParseQuantityError {
  /** Union discriminator for [[QuantityParseResult]]. */
  ok: false;
  /** The specific error that occurred during parsing. */
  error: ParseError;
}

link
Current design only provides an error. It seemed a better design to suggest a possible value.

For example, with the default BaseFormat, an input like 1,..2 results in an error but also suggests a value of 1.2, that could guide users toward the correct format.

Proposed Enhancement
Include a "suggested value" in ParseQuantityError to make error handling more user-friendly. For instance:

Input: 1,..2
Current Output: Error without suggestion
Suggested Output: Error with a suggested value of 1.2

Use Case References
Rn this API is utilized in locations such as:
AccuDraw.ts#L1074
AccuDraw.ts#L1042

Currently, those methods only returns a value when parseResult.ok is true.