EQL: extend LIKE operator with ESCAPE sequence

[ghost]

Description

Currently like() operator in EQL has no possibility to search for the presence of characters that would normally be interpreted as wildcards.

Such feature is supported in standard SQL via optional parameter of LIKE operator -- LIKE string_pattern [ESCAPE escape_sequence].

Need to enhance EQL like() operator in similar manner.

Expected outcome

The ability to include wildcards within EQL like() operator search.

[homedirectory]

Automatic escaping of wildcard characters was implemented in #2377.