Improve error message when there's typo in the comparison operator

[ronja-ui]

Description

The current error message isn't human readable for the user when there's a typo in the comparison operator.

The following query

index=example earliest=-5y
| where _raw =< 50

causes the following message:

java.lang.IllegalStateException: Parser failure on line 2, column 14 due to extraneous input '<' expecting {EVAL_LANGUAGE_MODE_PARENTHESIS_L, EVAL_LANGUAGE_MODE_INTEGER, EVAL_LANGUAGE_MODE_DECIMAL, EVAL_LANGUAGE_MODE_EXCLAMATION, EVAL_LANGUAGE_MODE_NOT, EVAL_LANGUAGE_MODE_ABS, EVAL_LANGUAGE_MODE_ACOS, EVAL_LANGUAGE_MODE_ACOSH, EVAL_LANGUAGE_MODE_ASIN, EVAL_LANGUAGE_MODE_ASINH, EVAL_LANGUAGE_MODE_ATAN, EVAL_LANGUAGE_MODE_ATAN2, EVAL_LANGUAGE_MODE_ATANH, EVAL_LANGUAGE_MODE_AVG, EVAL_LANGUAGE_MODE_CASE, EVAL_LANGUAGE_MODE_CEILING, EVAL_LANGUAGE_MODE_CIDRMATCH, EVAL_LANGUAGE_MODE_COALESCE, EVAL_LANGUAGE_MODE_COMMANDS, EVAL_LANGUAGE_MODE_COS, EVAL_LANGUAGE_MODE_COSH, EVAL_LANGUAGE_MODE_EXACT, EVAL_LANGUAGE_MODE_EXP, EVAL_LANGUAGE_MODE_FALSE, EVAL_LANGUAGE_MODE_FLOOR, EVAL_LANGUAGE_MODE_HYPOT, EVAL_LANGUAGE_MODE_IF, EVAL_LANGUAGE_MODE_IFNULL, EVAL_LANGUAGE_MODE_IN, EVAL_LANGUAGE_MODE_ISBOOL, EVAL_LANGUAGE_MODE_ISINT, EVAL_LANGUAGE_MODE_ISNOTNULL, EVAL_LANGUAGE_MODE_ISNULL, EVAL_LANGUAGE_MODE_ISNUM, EVAL_LANGUAGE_MODE_ISSTR, EVAL_LANGUAGE_MODE_JSON_VALID, EVAL_LANGUAGE_MODE_LEN, EVAL_LANGUAGE_MODE_LIKE, EVAL_LANGUAGE_MODE_LN, EVAL_LANGUAGE_MODE_LOG, EVAL_LANGUAGE_MODE_LOWER, EVAL_LANGUAGE_MODE_LTRIM, EVAL_LANGUAGE_MODE_MATCH, EVAL_LANGUAGE_MODE_MAX, EVAL_LANGUAGE_MODE_MD5, EVAL_LANGUAGE_MODE_MIN, EVAL_LANGUAGE_MODE_MVAPPEND, EVAL_LANGUAGE_MODE_MVCOUNT, EVAL_LANGUAGE_MODE_MVDEDUP, EVAL_LANGUAGE_MODE_MVFILTER, EVAL_LANGUAGE_MODE_MVFIND, EVAL_LANGUAGE_MODE_MVINDEX, EVAL_LANGUAGE_MODE_MVJOIN, EVAL_LANGUAGE_MODE_MVRANGE, EVAL_LANGUAGE_MODE_MVSORT, EVAL_LANGUAGE_MODE_MVZIP, EVAL_LANGUAGE_MODE_NOW, EVAL_LANGUAGE_MODE_NULL, EVAL_LANGUAGE_MODE_NULLIF, EVAL_LANGUAGE_MODE_PI, EVAL_LANGUAGE_MODE_POW, EVAL_LANGUAGE_MODE_RANDOM, EVAL_LANGUAGE_MODE_RELATIVE_TIME, EVAL_LANGUAGE_MODE_REPLACE, EVAL_LANGUAGE_MODE_ROUND, EVAL_LANGUAGE_MODE_RTRIM, EVAL_LANGUAGE_MODE_SEARCHMATCH, EVAL_LANGUAGE_MODE_SHA1, EVAL_LANGUAGE_MODE_SHA256, EVAL_LANGUAGE_MODE_SHA512, EVAL_LANGUAGE_MODE_SIGFIG, EVAL_LANGUAGE_MODE_SIN, EVAL_LANGUAGE_MODE_SINH, EVAL_LANGUAGE_MODE_SPATH, EVAL_LANGUAGE_MODE_SPLIT, EVAL_LANGUAGE_MODE_SQRT, EVAL_LANGUAGE_MODE_STRFTIME, EVAL_LANGUAGE_MODE_STRPTIME, EVAL_LANGUAGE_MODE_SUBSTR, EVAL_LANGUAGE_MODE_SUM, EVAL_LANGUAGE_MODE_TAN, EVAL_LANGUAGE_MODE_TANH, EVAL_LANGUAGE_MODE_TIME, EVAL_LANGUAGE_MODE_TONUMBER, EVAL_LANGUAGE_MODE_TOSTRING, EVAL_LANGUAGE_MODE_TRIM, EVAL_LANGUAGE_MODE_TRUE, EVAL_LANGUAGE_MODE_TYPEOF, EVAL_LANGUAGE_MODE_UPPER, EVAL_LANGUAGE_MODE_URLDECODE, EVAL_LANGUAGE_MODE_VALIDATE, EVAL_LANGUAGE_MODE_JSON_OBJECT, EVAL_LANGUAGE_MODE_STRING_MATCH, EVAL_LANGUAGE_MODE_SINGLE_QUOTED_STRING_MATCH, EVAL_LANGUAGE_MODE_QUOTED_STRING_MATCH}
Please check that the query is written correctly. Otherwise, please report this error and include the query used and this error.

At least the current error message's last sentence should appear in the first line. It's easy to miss in the current state.