fix(http/format): fix bug when url use composed collection id

[benoitdm-oslandia]

• rework RequestedFormat to return json when nothing matches instead of unknown suffix
• fix getRequestVarStrip to handle stripping according to current format
• add missing tablename when creating mock features
• add test in db to check RequestedFormat with composed collection name (schema + table)
• fix bad error management in handleCollection

closes #151

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Package	Line Rate	Health
github.com/CrunchyData/pg_featureserv/internal/api	89%	✔
github.com/CrunchyData/pg_featureserv/internal/conf	53%	❌
github.com/CrunchyData/pg_featureserv/internal/cql	66%	➖
github.com/CrunchyData/pg_featureserv/internal/data	63%	➖
github.com/CrunchyData/pg_featureserv/internal/service	67%	➖
github.com/CrunchyData/pg_featureserv/internal/ui	82%	✔
github.com/CrunchyData/pg_featureserv/internal/util	73%	➖
github.com/CrunchyData/pg_featureserv	22%	❌
Summary	69% (6170 / 8995)	➖

Minimum allowed line rate is 60%

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