refactor: reorganize package structure for better domain grouping

- telemetry/ → observability/ (with log/ merged as observability/logger/)
- jsondiff/, rql/ → data/jsondiff/, data/rql/
- Fix otelhhtpclient typo → otelhttpclient
- Inline utils/error_status into observability/otelgrpc/status.go, delete utils/
- Rename log package to logger to match directory
- Update all internal imports and README

feat (rql): add ilike and notilike support (#83)

feat(rql): add function to get data type of field (#80)

feat: add util function to get type of field

feat(rql): add function to get data type of field (#80)

feat: add util function to get type of field

feat: add more string operators (#78)

feat: add support for string operators

feat: add in and notIn operator for string datatype (#77)

* feat: add in operator for string datatype

* feat: add not in operator for string datatype

refactor: change key name (#75)

fix: update go version

fix(rql): add `lt` operation in string and date type (#74)

fix(rql): add lt operation in string and date type

fix(rql): add `lt` operation in string and date type (#74)

fix(rql): add lt operation in string and date type