[foreign-jextract] RFR: 8242465: jextract should skip variables and struct fields with types that cannot be handled

[Athijegannathan Sundararajan]

skipping problematic variables, generating empty structs for structs with problematic fields.

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Commit messages:
 - 8242465: jextract should skip variables and struct fields with types that cannot be handled
 - avoiding toJavaArray. printing by accessing native array directly (Cdouble's indexed getter)
 - 8242376: update jextract samples to avoid --filter option

Changes: https://git.openjdk.java.net/panama-foreign/pull/108/files
 Webrev: https://webrevs.openjdk.java.net/panama-foreign/108/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8242465
  Stats: 322 lines in 5 files changed: 296 ins; 12 del; 14 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/108.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/108/head:pull/108

PR: https://git.openjdk.java.net/panama-foreign/pull/108