A simple picocli/native-image ion-java CLI

[jobarr-amzn]

Issue #, if available:

Description of changes: Supports formatted transcription of input files or stdin to a destination file or stdout.

help showing subcommands

❯ jion help
Usage: jion [-hV] [-f=<format>] [-o=FILE] [FILE...] [COMMAND]
[FILE...]
-f, --format, --output-format=<format>
Output format, from the set (text | pretty | binary | none).
-h, --help Show this help message and exit.
-o, --output=FILE Output file
-V, --version Print version information and exit.
Commands:
help Display help information about the specified command.
cat, process concatenate FILE(s) in the requested Ion output format

help cat showing inherited options

❯ jion help cat
Usage: jion cat [-hV] [-f=<format>] [-o=FILE]
concatenate FILE(s) in the requested Ion output format
-f, --format, --output-format=<format>
Output format, from the set (text | pretty | binary | none).
-h, --help Show this help message and exit.
-o, --output=FILE Output file
-V, --version Print version information and exit.

Rewriting Ion 1.1 with a macro invocation to Ion 1.0

❯ echo '$ion_1_1 (:make_string "hello" " " "world")' | jion cat -f binary | hexyl
┌────────┬─────────────────────────┬─────────────────────────┬────────┬────────┐
│00000000│ e0 01 00 ea 8b 68 65 6c ┊ 6c 6f 20 77 6f 72 6c 64 │ו⋄××hel┊lo world│
└────────┴─────────────────────────┴─────────────────────────┴────────┴────────┘

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jobarr-amzn]

Ah oops, I built this locally with GraalVM CE 17 as described in the comments in build.gradle.kts.

Looks like it will need more refinement of the build script to fix the build in other contexts- I want to only build the native component when GRAALVM_HOME is set. I can fix this... should probably extract to a separate Gradle project anyway.