feat!: rename IP4/6_POLICY to IP4/6_PROVIDER

[favonia]

Close #166.

[codecov]

Codecov Report

Merging #167 (3bf2e12) into main (718d43a) will increase coverage by 0.77%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   83.03%   83.80%   +0.77%     
==========================================
  Files          27       27              
  Lines        1491     1562      +71     
==========================================
+ Hits         1238     1309      +71     
  Misses        248      248              
  Partials        5        5              

Flag	Coverage Δ
unittests	83.80% <100.00%> (+0.77%)	⬆️

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Impacted Files	Coverage Δ
internal/provider/ip.go	100.00% <ø> (ø)
internal/config/config.go	98.51% <100.00%> (ø)
internal/config/env.go	100.00% <100.00%> (ø)
internal/provider/base.go	100.00% <100.00%> (ø)
internal/provider/cloudflare_doh.go	100.00% <100.00%> (ø)
internal/provider/cloudflare_trace.go	100.00% <100.00%> (ø)
internal/provider/dns.go	96.61% <100.00%> (ø)
internal/provider/http.go	84.61% <100.00%> (ø)
internal/provider/ipify.go	100.00% <100.00%> (ø)
internal/provider/local.go	100.00% <100.00%> (ø)
... and 3 more

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