Add references to Jaeger v2

[yurishkuro]

• add reference to the blog post to the main README
• add reference to v2 instructions to HotROD README
• create examples/hotrod/docker-compose-v2.yml to run with v2
• add "Try it out" section to cmd/jaeger/README.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.66%. Comparing base (5bf667e) to head (62a2018).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5779      +/-   ##
==========================================
- Coverage   96.67%   96.66%   -0.02%     
==========================================
  Files         342      342              
  Lines       16519    16519              
==========================================
- Hits        15970    15968       -2     
- Misses        360      362       +2     
  Partials      189      189              

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.81% <ø> (ø)
cassandra-3.x-v1	16.61% <ø> (ø)
cassandra-3.x-v2	1.74% <ø> (ø)
cassandra-4.x-v1	16.61% <ø> (ø)
cassandra-4.x-v2	1.74% <ø> (ø)
elasticsearch-6.x-v1	18.78% <ø> (ø)
elasticsearch-7.x-v1	18.83% <ø> (ø)
elasticsearch-8.x-v1	19.02% <ø> (-0.02%)	⬇️
elasticsearch-8.x-v2	1.80% <ø> (-0.02%)	⬇️
grpc_v1	9.52% <ø> (ø)
grpc_v2	7.14% <ø> (ø)
kafka	9.74% <ø> (ø)
memory_v2	1.81% <ø> (ø)
opensearch-1.x-v1	18.89% <ø> (+0.01%)	⬆️
opensearch-2.x-v1	18.88% <ø> (-0.02%)	⬇️
opensearch-2.x-v2	1.80% <ø> (ø)
unittests	95.09% <ø> (-0.02%)	⬇️

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