[pgadmin-hackers][patch] Syntax Highlighting Color Change RM #2215

As a query writer I want to be able to see the syntax highlighted colors even if I am colorblind so that I can easily make sense of the code I am writing.

GIVEN**
 I am writing a query in pgAdmin 4
*WHEN*
 I write a word that is syntactically highlighted
**THEN that word should be highlighted according to the rules below.

for <span class="cm-keyword"> : #908, 
for <span class="cm-number"> : #964,