feat: add conditional property to disable GraphQLController

[igdianov]

This PR adds support to disable GraphQLController auto configuration using spring.graphql.jpa.query.web.enabled property. The auto configuration will also be disabled if spring.graphql.jpa.query.enabled=false

Fixes #144

[codecov]

Codecov Report

Merging #161 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #161   +/-   ##
=========================================
  Coverage     68.11%   68.11%           
  Complexity      498      498           
=========================================
  Files            33       33           
  Lines          2578     2578           
  Branches        431      431           
=========================================
  Hits           1756     1756           
  Misses          644      644           
  Partials        178      178

Impacted Files	Coverage Δ	Complexity Δ
...oconfigure/GraphQLControllerAutoConfiguration.java	100% <ø> (ø)	1 <0> (ø)	⬇️

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