Reduce db calls when presenting droplets

[philippthun]

Eager load metadata, buildpack_lifecycle_data, buildpack_lifecycle_buildpacks, and cnb_lifecycle_data.

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[philippthun]

Tests with production data (GET /v3/droplets?per_page=5000 as admin user) show significant improvements:

response time:  ~27s    ->  ~2s
db queries:     ~20000  ->  ~10
db query time:  ~12s    ->  ~0.5s