keyValueMap should not prevent further parameters

[senia-psm]

The first usage option for keyValueMap is quite useful - -D key1=value -D key2=value.

But the second usage option -D key1=value key2=value prevents any further parameters.

This command fails with error:

-D key=value arg.

java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1

It would be more useful if we would be able to disable the second usage options.

Use case: docker -e ENV1=VAL1 -e ENV2=EVAL2 arg1 arg2

Reproducer: https://github.com/senia-psm/zio-cli-226

 $ ./bin/test --env a=b abc
timestamp=2023-07-14T16:30:17.631304859Z level=ERROR thread=#zio-fiber-1 message="" cause="Exception in thread "zio-fiber-4" java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1
        at zio.cli.Options$KeyValueMap.createMapEntry$1(Options.scala:475)
        at zio.cli.Options$KeyValueMap.createMapFromStringList$1$$anonfun$2(Options.scala:471)

[jdegoes]

/bounty $75

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Attempt	Started	Solution
🟢 @ithinkicancode		#229

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