OpenTelemetry migration

[mantzas]

Which problem is this PR solving?

Resolves #434.

Short description of the changes

• Introduced a observability package

[codecov]

Codecov Report

Attention: Patch coverage is 79.04903% with 141 lines in your changes missing coverage. Please review.

Project coverage is 84.90%. Comparing base (5a27b29) to head (7ec78bd).

Files	Patch %	Lines
observability/metric/meter.go	22.80%	42 Missing and 2 partials ⚠️
component/amqp/component.go	48.27%	13 Missing and 2 partials ⚠️
observability/observability.go	70.00%	6 Missing and 6 partials ⚠️
component/kafka/component.go	71.79%	11 Missing ⚠️
client/mqtt/publisher.go	60.00%	8 Missing ⚠️
client/amqp/amqp.go	73.07%	7 Missing ⚠️
client/kafka/sync_producer.go	66.66%	6 Missing ⚠️
component/http/cache/cache.go	54.54%	5 Missing ⚠️
client/kafka/kafka.go	80.95%	4 Missing ⚠️
client/redis/redis.go	42.85%	2 Missing and 2 partials ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #685      +/-   ##
==========================================
+ Coverage   79.49%   84.90%   +5.40%     
==========================================
  Files          68       63       -5     
  Lines        4067     3106     -961     
==========================================
- Hits         3233     2637     -596     
+ Misses        682      343     -339     
+ Partials      152      126      -26     

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