Improved handling of with statements

[macbre]

This release of sql-metadata brings even further improvement of handling of with and table creation statements. We also keep up to date with our dependencies and improving CI pipeline.

build(deps-dev): bump black from 21.5b2 to 21.6b0 #167
Fix create schema #171
Create table with schema detects field names as tables #168
Fix for nested with statements in select #173
CI - install Poetry 1.1.7 #174
build(deps-dev): bump pylint from 2.8.3 to 2.9.0 #178
nested with statement causes confusion #172
build(deps-dev): bump pylint from 2.9.0 to 2.9.1 #179
build(deps-dev): bump pylint from 2.9.1 to 2.9.3 #180

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