feat: link shoutrrr and initialize services (part 1 of shoutrrr support)

[favonia]

Related: #532 and #632.

• Modify setter/updater to generate messages
• Real-life testing

[codecov]

Codecov Report

Merging #633 (da0b456) into main (17c7b61) will increase coverage by 0.32%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #633      +/-   ##
==========================================
+ Coverage   88.50%   88.83%   +0.32%     
==========================================
  Files          45       48       +3     
  Lines        2341     2410      +69     
==========================================
+ Hits         2072     2141      +69     
  Misses        259      259              
  Partials       10       10              

Flag	Coverage Δ
unittests	88.83% <100.00%> (+0.32%)	⬆️

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

Files	Coverage Δ
internal/config/config.go	100.00% <100.00%> (ø)
internal/config/config_print.go	100.00% <100.00%> (ø)
internal/config/config_read.go	100.00% <100.00%> (ø)
internal/config/env_base.go	100.00% <100.00%> (ø)
internal/config/env_notifier.go	100.00% <100.00%> (ø)
internal/monitor/healthchecks.go	86.04% <100.00%> (ø)
internal/monitor/uptimekuma.go	95.69% <100.00%> (ø)
internal/notifier/composite.go	100.00% <100.00%> (ø)
internal/notifier/shoutrrr.go	100.00% <100.00%> (ø)

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