Feature/redis cache

[jmkerloch]

related #89

Configuration

• update .toml example with cache configuration
• add Redis cache configuration and option to define type of cache:
  • in .toml configuration file
  • from environnement variable PGFS_CACHE_REDIS_URL / PGFS_CACHE_REDIS_PASSWORD
  • remove PGFS_CACHE and define activation depending on PGFS_CACHE_TYPE (Disabled / Naive / Redis)
• refactoring to add functions for cache related initialization initCache / initNaiveCache / initRedisCache
• a dump of cache configuration

Cacher interface

• update AddWeakEtag and RemoveWeakEtag function to return error
• :warning: for now if an error is returned, a message is displayed in log as a warning

CacheRedis implementation of Cacher

• new implementation with use of a Redis server

API

• etag.go : add EtagToWeakEtag function to mutualize code for CacheRedis and CacheNaive

GitHub Action

• add redis service for CacheRedis tests

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Package	Line Rate	Health
github.com/CrunchyData/pg_featureserv/internal/api	90%	✔
github.com/CrunchyData/pg_featureserv/internal/conf	53%	❌
github.com/CrunchyData/pg_featureserv/internal/cql	66%	➖
github.com/CrunchyData/pg_featureserv/internal/data	61%	➖
github.com/CrunchyData/pg_featureserv/internal/service	66%	➖
github.com/CrunchyData/pg_featureserv/internal/ui	70%	➖
github.com/CrunchyData/pg_featureserv/internal/util	73%	➖
github.com/CrunchyData/pg_featureserv	22%	❌
Summary	68% (6005 / 8819)	➖

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