Add better logging options

[yurishkuro]

Which problem is this PR solving?

• Part of [Bug]: The results filtered through the tag in the findtrace page did not match expectations #5290
• It's difficult to troubleshoot ES queries because logs are always written in JSON format, so the ES req/resp JSON is being escaped.

Description of the changes

• Add --log-encoding option to allow changing logs to plain text (console).
• Fix logger initialization for ES to reuse the existing logger instead of creating a new one (new one was switching back to JSON)

How was this change tested?

$ SPAN_STORAGE_TYPE=elasticsearch go run -tags=ui ./cmd/all-in-one --es.log-level=debug --log-encoding=console

A query is logged like this:

2024-06-22T22:56:34.272-0400	info	elastic@v6.2.37+incompatible/client.go:835	GET /_msearch?rest_total_hits_as_int=true HTTP/1.1
Host: 127.0.0.1:9200
User-Agent: elastic/6.2.37 (darwin-arm64)
Content-Length: 310
Accept: application/json
Content-Type: application/json
Accept-Encoding: gzip

{"ignore_unavailable":true,"indices":["jaeger-span-2024-06-23","jaeger-span-2024-06-22","jaeger-span-2024-06-21","jaeger-span-2024-06-20"]}
{"query":{"bool":{"must":{"term":{"traceID":"1a2cee16e928c8a2f00d9ae784d8cccc"}}}},"search_after":[1718848594271777],"size":10000,"sort":[{"startTime":{"order":"asc"}}]}

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.38%. Comparing base (ca8cdae) to head (730917f).

Files	Patch %	Lines
cmd/internal/flags/flags.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5675      +/-   ##
==========================================
- Coverage   96.39%   96.38%   -0.02%     
==========================================
  Files         329      329              
  Lines       16056    16060       +4     
==========================================
+ Hits        15477    15479       +2     
- Misses        403      404       +1     
- Partials      176      177       +1     

Flag	Coverage Δ
badger_v1	8.04% <0.00%> (+<0.01%)	⬆️
badger_v2	1.92% <0.00%> (+<0.01%)	⬆️
cassandra-3.x-v1	16.60% <0.00%> (+<0.01%)	⬆️
cassandra-3.x-v2	1.84% <0.00%> (+<0.01%)	⬆️
cassandra-4.x-v1	16.60% <0.00%> (+<0.01%)	⬆️
cassandra-4.x-v2	1.84% <0.00%> (+<0.01%)	⬆️
elasticsearch-7.x-v1	18.87% <100.00%> (+<0.01%)	⬆️
elasticsearch-8.x-v1	19.08% <100.00%> (+0.01%)	⬆️
elasticsearch-8.x-v2	19.08% <100.00%> (+0.01%)	⬆️
grpc_v1	9.46% <0.00%> (-0.02%)	⬇️
grpc_v2	7.47% <0.00%> (+<0.01%)	⬆️
kafka	9.76% <0.00%> (+<0.01%)	⬆️
opensearch-1.x-v1	18.92% <100.00%> (+0.01%)	⬆️
opensearch-2.x-v1	18.92% <100.00%> (+0.01%)	⬆️
opensearch-2.x-v2	18.92% <100.00%> (+0.01%)	⬆️
unittests	94.23% <85.71%> (-0.02%)	⬇️

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