Make resolver cache durations configurable

[M4tthewDE]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

Should be reviewed carefully, since wrong default cache durations can slip in easily.
There might be some caches that aren't of type NewPostgreSQLCache of which I might be unaware of.
Closes #410

[codecov]

Codecov Report

Merging #419 (459c183) into master (031b678) will increase coverage by 0.26%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
+ Coverage   44.49%   44.76%   +0.26%     
==========================================
  Files         101      101              
  Lines        3713     3731      +18     
==========================================
+ Hits         1652     1670      +18     
  Misses       2013     2013              
  Partials       48       48              

Impacted Files	Coverage Δ
internal/caches/twitchusernamecache/cache.go	0.00% <0.00%> (ø)
internal/resolvers/oembed/resolver.go	0.00% <0.00%> (ø)
internal/resolvers/betterttv/emote_resolver.go	100.00% <100.00%> (ø)
internal/resolvers/default/link_resolver.go	44.85% <100.00%> (ø)
internal/resolvers/discord/invite_resolver.go	53.84% <100.00%> (ø)
internal/resolvers/frankerfacez/emote_resolver.go	100.00% <100.00%> (ø)
internal/resolvers/imgur/resolver.go	89.28% <100.00%> (ø)
...nternal/resolvers/livestreamfails/clip_resolver.go	100.00% <100.00%> (ø)
internal/resolvers/seventv/emote_resolver.go	100.00% <100.00%> (ø)
internal/resolvers/supinic/track_resolver.go	35.71% <100.00%> (ø)
... and 7 more

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[pajlada]

Revert the "header cache configuration" piece, they should be based on the provider's cache duration as stated in the TODO