RFR: 7904049: Add LLM inference example to jextract samples [v2]

[Nizar Benalla]

> Please review this PR to add an LLM inference example to the jextract samples.
> 
> Thanks!

Nizar Benalla has updated the pull request incrementally with one additional commit since the last revision:

  use `MemorySegment::reinterpret` to clean up objects
  modify compile script slightly

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

Changes:
  - all: https://git.openjdk.org/jextract/pull/285/files
  - new: https://git.openjdk.org/jextract/pull/285/files/84ee7762..b023e0a0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jextract&pr=285&range=01
 - incr: https://webrevs.openjdk.org/?repo=jextract&pr=285&range=00-01

  Stats: 21 lines in 2 files changed: 8 ins; 6 del; 7 mod
  Patch: https://git.openjdk.org/jextract/pull/285.diff
  Fetch: git fetch https://git.openjdk.org/jextract.git pull/285/head:pull/285

PR: https://git.openjdk.org/jextract/pull/285