#902 Support USE statement in ANSI

[dmateusp]

Resolves #902

[codecov]

Codecov Report

Merging #950 (2478c0f) into master (f32e63f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #950   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files         115      115           
  Lines        7766     7766           
=======================================
  Hits         7471     7471           
  Misses        295      295           

Flag	Coverage Δ
dbt017-py38	60.86% <100.00%> (+0.06%)	⬆️
dbt018-py38	60.89% <100.00%> (+0.06%)	⬆️
dbt019-py38	60.89% <100.00%> (+0.06%)	⬆️
py36	95.40% <100.00%> (ø)
py37	95.40% <100.00%> (ø)
py38	95.36% <100.00%> (ø)
py39	95.36% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/sqlfluff/dialects/dialect_snowflake.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_ansi.py	100.00% <100.00%> (ø)

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