OPENNLP-53: Add Parse.createFromTokens() for convenient tokenized input

[mawiesne]

What does this PR do?

• Adds a static factory method to Parse that creates a parse structure directly from a String[] of tokens, avoiding the need to manually join tokens, compute character offsets, and build the initial parse tree.
• Adds a ParserTool.parseLine(String[], Parser, int) overload and refactor existing code to use the new method.

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[mawiesne]

Thx @rzo1 for the PR. We need some slight adjustments/enhancements, see my four minor comments.

[mawiesne]

🍒ed to maintenance branch 2.x