fix missing scalar alias generation, add Accept header and improve response decoding

[hgiasac]

• Fix missing scalar type alias from primitive scalars.
• Add the Accept request header with the value from the response content type.
• Decode the response in JSON/XML format if the content type contains +json or +xml suffix.
• Mask sensitive headers that are forwarded from the v3-engine

[github-actions]

Package	Line Rate	Health
github.com/hasura/ndc-http/connector	50%	➖
github.com/hasura/ndc-http/connector/internal/argument	52%	➖
github.com/hasura/ndc-http/connector/internal	55%	➖
github.com/hasura/ndc-http/connector/internal/contenttype	57%	➖
github.com/hasura/ndc-http/connector/internal/security	60%	➖
github.com/hasura/ndc-http/ndc-http-schema/configuration	40%	❌
github.com/hasura/ndc-http/ndc-http-schema/openapi/internal	50%	➖
github.com/hasura/ndc-http/ndc-http-schema/openapi	40%	➖
github.com/hasura/ndc-http/ndc-http-schema/schema	30%	❌
github.com/hasura/ndc-http/ndc-http-schema/utils	43%	➖
Summary	48% (4051 / 8423)	➖

Minimum allowed line rate is 40%