[foreign-memaccess+abi] RFR: Add an internal MemoryInspection class [v2]

[Per Minborg]

> This PR adds a way of inspecting a `MemoryLayout` through a `MemoryLayout`.
> 
> 
>     /**
>      * Returns a human-readable view of the provided {@linkplain MemorySegment memory} viewed
>      * through the provided {@linkplain MemoryLayout layout} using the provided {@linkplain ValueLayoutRenderer renderer}.
>      * <p>
>      * The exact format of the returned view is unspecified and should not
>      * be acted upon programmatically.
>      * <p>
>      * As an example, a MemorySegment viewed though the following memory layout
>      * {@snippet lang = java:
>      * var layout = MemoryLayout.structLayout(
>      *         ValueLayout.JAVA_INT.withName("x"),
>      *         ValueLayout.JAVA_INT.withName("y")
>      * ).withName("Point");
>      *
>      * MemoryInspection.inspect(segment, layout, ValueLayoutRenderer.standard())
>      *     .forEach(System.out::println);
>      *
>      *}
>      * might be rendered to something like this:
>      * {@snippet lang = text:
>      * Point {
>      *   x=1,
>      *   y=2
>      * }
>      *}
>      * <p>
>      * This method is intended to view memory segments through small and medium-sized memory layouts.
>      *
>      * @param segment  to be viewed
>      * @param layout   to use as a layout when viewing the memory segment
>      * @param renderer to apply when rendering value layouts
>      * @return a view of the memory abstraction viewed through the memory layout
>      */
>     public static Stream<String> inspect(MemorySegment segment,
>                                          MemoryLayout layout,
>                                          ValueLayoutRenderer renderer) {

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Update after review

-------------

Changes:
  - all: https://git.openjdk.org/panama-foreign/pull/715/files
  - new: https://git.openjdk.org/panama-foreign/pull/715/files/0174c0ed..29dc714b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-foreign&pr=715&range=01
 - incr: https://webrevs.openjdk.org/?repo=panama-foreign&pr=715&range=00-01

  Stats: 281 lines in 3 files changed: 34 ins; 174 del; 73 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/715.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign pull/715/head:pull/715

PR: https://git.openjdk.org/panama-foreign/pull/715