Add the AvoidSemicolonsAsLineTerminators rule to warn about lines ending with a semicolon. Fix (#824)

[tempora-mutantur]

It's a rule to warn about lines ending with a semicolon

PR Summary

Add the PSAvoidSemicolonsAsLineTerminators rule to warn about lines ending with a semicolon. Covered with tests. The rule is disabled by default as it's more of a styling preference. #824

PR Checklist

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• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
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