AVRO-4313: [java] Tighten javaAnnotation string-literal validation in SpecificCompiler (#3892)

* AVRO-4313: [java] Tighten javaAnnotation string-literal validation in SpecificCompiler

The string-literal grammar used to validate javaAnnotation values accepted
an unescaped quote inside the literal body, letting a single literal span
past its intended closing quote and absorb surrounding tokens. Constrain the
body to recognized escape sequences or characters that are not a quote,
backslash, or line terminator, and add a regression test.

* AVRO-4313: Exclude all line terminators from annotation string literals

Also reject NEL, LS and PS in addition to CR and LF so an annotation value
cannot span multiple lines in the generated source.

* AVRO-4313: Make injection regression test robust to multiple outputs

Assert the injection payload is absent from every generated file and the
valid annotation is emitted in at least one, rather than requiring it in
each output file.