Add support for schema registry basic auth

[gtyanchev]

Currently our schema registry client receives as a parameter only schema.registry.url which makes it impossible to connect to schema registry with enabled basic auth.

This PR adds support for additional configuration map that for example may contain auth parameters:

(def basic-auth-config {"basic.auth.credentials.source" "USER_INFO"
                        "basic.auth.user.info"          "fred:letmein"}

The map can be passed in various places:

• in jackdaw.serdes.avro.schema-registry/client

  (client "http://localhost:8081" 10 basic-auth-config)

• in jackdaw.serdes.resolver/serde-resolver

  (serde-resolver :schema-registry-url "http://localhost:8081" :schema-registry-config basic-auth-config)

• in jackdaw.serdes.avro.confluent/serde

  (serde "http://localhost:8081" schema key? {:schema-registry-config basic-auth-config})

• in jackdaw.serdes.avro/serde

  (serde {:avro.schema-registry/url "http://localhost:8081"
         :avro.schema-registry/config basic-auth-config} 
        topic-config)

Checklist

• [ ] tests
• [x] updated CHANGELOG (the "unreleased" section)

[codecov[bot]]

Codecov Report

Merging #265 (2e2f37d) into restore-test-fixtures-module (3524968) will decrease coverage by 0.34%. The diff coverage is 93.33%.

@@                       Coverage Diff                        @@
##           restore-test-fixtures-module     #265      +/-   ##
================================================================
- Coverage                         80.36%   80.01%   -0.35%     
================================================================
  Files                                42       42              
  Lines                              2745     2747       +2     
  Branches                            157      157              
================================================================
- Hits                               2206     2198       -8     
- Misses                              382      392      +10     
  Partials                            157      157              

Impacted Files	Coverage Δ
src/jackdaw/serdes/avro.clj	89.04% <85.71%> (-0.04%)	:arrow_down:
src/jackdaw/serdes/avro/confluent.clj	100.00% <100.00%> (ø)
src/jackdaw/serdes/avro/schema_registry.clj	100.00% <100.00%> (ø)
src/jackdaw/serdes/resolver.clj	91.17% <100.00%> (+0.26%)	:arrow_up:
src/jackdaw/serdes/edn2.clj	45.45% <0.00%> (-45.46%)	:arrow_down:

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