Change to parameterize AdminClientSettings on effect type

[vlovgr]

Similarly to #118 and #120, this pull request parameterizes AdminClientSettings on the effect type F[_], requiring Sync[F].

Detailed changes as follows.

• Remove AdminClientFactory.
• Add createAdminClient and withCreateAdminClient to AdminClientSettings.
• Replace AdminClientSettings.Default with apply (use AdminClientSettings[F]).
• Remove adminClientFactory and withAdminClientFactory from AdminClientSettings.
• Change to parameterize AdminClientSettings on the effect type F[_], requiring Sync[F].

[codecov]

Codecov Report

Merging #125 into 0.20.x will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           0.20.x     #125      +/-   ##
==========================================
- Coverage   93.37%   93.35%   -0.02%     
==========================================
  Files          41       40       -1     
  Lines        1177     1174       -3     
  Branches       79       80       +1     
==========================================
- Hits         1099     1096       -3     
  Misses         78       78

Impacted Files	Coverage Δ
src/main/scala/fs2/kafka/package.scala	100% <ø> (ø)	⬆️
src/main/scala/fs2/kafka/KafkaAdminClient.scala	100% <ø> (ø)	⬆️
src/main/scala/fs2/kafka/AdminClientSettings.scala	100% <100%> (ø)	⬆️

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