[foreign-memaccess+abi] RFR: 8291639: Improve the ability to visualize a MemorySegment in human readable forms [v15]

[Per Minborg]

> This PR proposes to add a "Record Mapper" that allows `MemorySegment` instances to be projected onto `Record` types given `GroupLayout` instances.
> 
> Here is a simple example of how to use the mapper:
> 
> 
>     private static final GroupLayout POINT_LAYOUT = MemoryLayout.structLayout(
>             JAVA_INT.withName("x"),
>             JAVA_INT.withName("y"));
> 
>     MemorySegment segment =  MemorySegment.ofArray(new int[]{3, 4});
> 
>     Point point = POINT_LAYOUT.recordMapper(Point.class)
>           .apply(segment); // Point[x=3, y=4]
> 
> 
> I think the implementation can be improved later, for example by de-duplicating handling of arrays and maybe add recursive "un-pealing" of multidimensional arrays.

Per Minborg has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 46 commits:

 - Merge foreign-memaccess+abi
 - Remove redundant imports
 - Use invokeExact and raw method handles for composition
 - Move method to class
 - Update array section doc
 - Define offset in the javadocs
 - Update javadoc
 - Use explicit call rather than using a method
 - Add variable Lookup
 - Break apart nested switch statements
 - ... and 36 more: https://git.openjdk.org/panama-foreign/compare/38f4bfe7...e0fb8727

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Changes: https://git.openjdk.org/panama-foreign/pull/833/files
 Webrev: https://webrevs.openjdk.org/?repo=panama-foreign&pr=833&range=14
  Stats: 1950 lines in 6 files changed: 1950 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/833.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign.git pull/833/head:pull/833

PR: https://git.openjdk.org/panama-foreign/pull/833