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* feat(tql): add initial support for start,stop,step as sql functions * fix(tql): remove unwraps, adjust fmt * fix(tql): address taplo issue * feat(tql): update parse_tql_query logic * fix(tql): change query parsing logic to use parser instead of delimiter * fix(tql): add timestamp function support, add sqlness tests * fix(tql): add lookback optional param for tql eval * fix(tql): adjust tests for now() function * fix(tql): introduce the tqlerror to differentiate failures on parsing, evaluation and simplification stages * fix(tql): add tests for explain/analyze * feat(tql): add lookback support for explain/analyze, update tests * feat(tql): add more sqlness tests * chore(tql): extract common logic for eval, analyze and explain into a single function * feat(tql): address CR points * feat(tql): use snafu for tql errors, add more docs * feat(tql): address CR points