[TraceQL] Support range operators for strings

[joe-elliott]

Is your feature request related to a problem? Please describe.
This query:

{span.http.status_code >= "200"}

will fail with this error:

illegal operation for the given types: span.http.status_code >= `200`

Support range operators (>, >= ,<=, <) for strings. Note that this should not attempt to convert strings to number values, but should instead use lexicographic ordering when comparing strings.