Optimize variable replacement RegEx

[parthverma1]

The older RegEx {{[^{}]*[&#=][^{}]*}} had a possibility of a ReDOS attack due to having polynomial complexity. The new RegEx {{[^{}]*}} encodes all variables before parsing unlike the older one which only encoded variables containing special characters.

The complexity can be checked and compared at: https://devina.io/redos-checker

Related PR: postmanlabs/postman-url-encoder#284

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8717977) to head (cced15c).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #1394   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           37        37           
  Lines         2186      2186           
  Branches       667       667           
=========================================
  Hits          2186      2186           

Flag	Coverage Δ
unit	100.00% <100.00%> (ø)

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