wrapper functions for endpoint calls

[bocops]

Replace direct use of DELETE/GET/PATCH/POST functions with getMastodonRequest() and related functions where possible, reducing exposure of Gson serializer.

Some special cases remain:

• Media.kt
• Streaming.kt
• postUserNameAndPassword() in sample apps

After cleanup of those and related tests, Gson instance no longer needs to be exposed via MastodonClient.getSerializer, and #51 can be closed.

[codecov]

Codecov Report

Merging #73 (d41c652) into master (104f880) will decrease coverage by 3.25%.
The diff coverage is 57.34%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #73      +/-   ##
============================================
- Coverage     44.68%   41.42%   -3.26%     
+ Complexity      169      167       -2     
============================================
  Files            62       62              
  Lines          1410     1376      -34     
  Branches         82       82              
============================================
- Hits            630      570      -60     
- Misses          762      785      +23     
- Partials         18       21       +3     

Impacted Files	Coverage Δ
.../kotlin/social/bigbone/api/method/MastodonLists.kt	0.00% <0.00%> (ø)
...e/src/main/kotlin/social/bigbone/MastodonClient.kt	10.13% <9.78%> (+2.44%)	⬆️
...kotlin/social/bigbone/api/method/FollowRequests.kt	42.85% <40.00%> (ø)
.../kotlin/social/bigbone/api/method/Notifications.kt	58.82% <53.84%> (-6.18%)	⬇️
...rc/main/kotlin/social/bigbone/api/method/Public.kt	80.64% <81.81%> (-3.57%)	⬇️
.../main/kotlin/social/bigbone/api/method/Statuses.kt	85.71% <85.71%> (-0.40%)	⬇️
.../main/kotlin/social/bigbone/api/method/Accounts.kt	88.23% <87.71%> (-0.99%)	⬇️
.../src/main/kotlin/social/bigbone/api/method/Apps.kt	92.50% <100.00%> (-0.19%)	⬇️
...rc/main/kotlin/social/bigbone/api/method/Blocks.kt	100.00% <100.00%> (ø)
...ain/kotlin/social/bigbone/api/method/Favourites.kt	100.00% <100.00%> (ø)
... and 10 more

[andregasser]

Sorry, had to tune CodeCov first, as their annotations polluted the diffs way too much. I am still not 100% happy with the CodeCov tool yet, but its less annoying than before. I still do not get how they calculate their metrics. But maybe it is because it is not configured correctly yet. Found some more info about it. Maybe will take another approach fixing it.

[andregasser]

That's great work! Highly appreciated. Looks much cleaner now. Just realized I need to dive into reified inline functions a bit more :-)

[bocops]

Yeah. The newly introduced functions in MastodonClient.kt are not being tested - but they are also just inlined wrappers around the functions that were previously called directly, so I think most of that "reduced coverage" is just an artifact of that.

I have some doubts about the testing that is currently going on, anyway, so increasing test coverage while we deal with individual entities and methods seems to be the best approach here.

Thanks for the review, merged and done! :)