Add env vars to dunstctl history, resolve #1425

[BinaryInk]

Thought it may be prudent of me to offer a fix once it occurred to me the fix would probably take less work than the workaround...

Adds the following to dunstctl history JSON output:

• urgency
• stack_tag
• urls

e.g.,

{
                "body" : {
                    "type" : "s",
                    "data" : "Test"
                },
                "message" : {
                    "type" : "s",
                    "data" : "<b>Test</b>\nTest"
                },
                "summary" : {
                    "type" : "s",
                    "data" : "Test"
                },
                "appname" : {
                    "type" : "s",
                    "data" : "TestingtonMcTestles"
                },
                "category" : {
                    "type" : "s",
                    "data" : ""
                },
                "default_action_name" : {
                    "type" : "s",
                    "data" : "default"
                },
                "icon_path" : {
                    "type" : "s",
                    "data" : ""
                },
                "id" : {
                    "type" : "i",
                    "data" : 2
                },
                "timestamp" : {
                    "type" : "x",
                    "data" : 159863270957
                },
                "timeout" : {
                    "type" : "x",
                    "data" : 5000
                },
                "progress" : {
                    "type" : "i",
                    "data" : -1
                },
                "urgency" : {
                    "type" : "s",
                    "data" : "CRITICAL"
                },
                "stack_tag" : {
                    "type" : "s",
                    "data" : ""
                },
                "urls" : {
                    "type" : "s",
                    "data" : ""
                }
            }

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.19%. Comparing base (63e6e88) to head (0643dec).
Report is 98 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1426      +/-   ##
==========================================
+ Coverage   65.17%   65.19%   +0.02%     
==========================================
  Files          50       50              
  Lines        8723     8729       +6     
  Branches     1034     1034              
==========================================
+ Hits         5685     5691       +6     
  Misses       3038     3038              

Flag	Coverage Δ
unittests	65.19% <100.00%> (+0.02%)	⬆️

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