Add a CLI to convert message files

[mpkorstanje]

🤔 What's changed?

Added a CLI to convert message files

⚡️ What's your motivation?

Proof of concept to see if it is possible to have a useful CLI tool in Java.

• Install jgo (https://github.com/scijava/jgo)
• Run mvn clean install
• Run jgo io.cucumber:junit-xml-formatter-cli:0.5.1-SNAPSHOT
• Observe:

jgo io.cucumber:junit-xml-formatter-cli:0.5.1-SNAPSHOT

Missing required parameter: '<source>'
Usage: to-junit-xml [-hV] <source>
Converts Cucumber messages to JUnit XML
      <source>    The source file containing Cucumber messages
  -h, --help      Show this help message and exit.
  -V, --version   Print version information and exit.

And

jgo io.cucumber:junit-xml-formatter-cli:0.5.1-SNAPSHOT testdata/minimal.feature.ndjson

<?xml version="1.0" encoding="UTF-8"?>
<testsuite name="Cucumber" time="0.005" tests="1" skipped="0" failures="0" errors="0">
<testcase classname="minimal" name="cukes" time="0.003">
<system-out><![CDATA[
Given I have 42 cukes in my belly...........................................passed
]]></system-out>
</testcase>
</testsuite>

🏷️ What kind of change is this?

• ⚡ New feature (non-breaking change which adds new behaviour)

♻️ Anything particular you want feedback on?

The naming of things. Just picked some at random.

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

[mpkorstanje]

Probably better to move this into a messages-cli project so we can also use commands to generate html, TestNG reports. And also have a CLI to parse gherkin.

[mpkorstanje]

Superseded by https://github.com/cucumber/messages-cli