raw-string-char grammar rule does not allow control characters

[springcomp]

Migrated from #14.

The following compliance tests illustrated using control characters, such as line feed in raw-string literals.

jmespath.test/tests/literal.json

Lines 154 to 161 in aa6fb5f

	{
	"expression": "'newline\n'",
	"result": "newline\n"
	},
	{
	"expression": "'\n'",
	"result": "\n"
	},

Text	Expression	ABNF	Expressed as JSON	Result
newline␊	`` 'newline\n' ````	"'newline" %x0A "'" ``	'\n'	"\n"
␊	'\n'	"'" %x0A "'"	'\n'	"newline\n"

However, those expressions are not valid as per the raw-string-char grammar rule:

raw-string        = "'" *raw-string-char "'" 
raw-string-char   = (%x20-26 / %x28-5B / %x5D-10FFFF) / preserved-escape / raw-string-escape 
preserved-escape  = escape (%x20-26 / %x28-5B / %x5D-10FFFF) 
raw-string-escape = escape ("'" / escape)

Please consider refactoring the compliance tests to forbid the use of C0 control characters in JMESPath expressions, as it Seems that was never the intended spirit when introduced in JEP-12.

Note: this will break non-conforming implementations.

[springcomp]

We decided to allow C0 control characters in raw-string literals after all.