added lateral keyword introduced in MySQL 8.0.14

[rozhnev]

Improved MySQL highlighting mode

Description of changes:
added lateral keyword introduced in MySQL 8.0.14

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[codecov]

Codecov Report

Base: 86.14% // Head: 86.14% // No change to project coverage 👍

Coverage data is based on head (98ad532) compared to base (75f5294).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5053   +/-   ##
=======================================
  Coverage   86.14%   86.14%           
=======================================
  Files         548      548           
  Lines       41692    41692           
  Branches     6563     6563           
=======================================
  Hits        35917    35917           
  Misses       5775     5775           

Flag	Coverage Δ
unittests	86.14% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/mode/mysql_highlight_rules.js	100.00% <100.00%> (ø)

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