Add support for entries filtering

[scordio]

• Type-specific filter conditions
  • Checkbox (Add initial support for Notion filters #23)
  • Date
  • Files
  • Formula
  • Multi-select (Add initial support for Notion filters #23)
  • Number (Add initial support for Notion filters #23)
  • People
  • Relation
  • Rich text
  • Rollup
  • Select (Add initial support for Notion filters #23)
  • Status
  • Timestamp
• Compound filter conditions (Add initial support for Notion filters #23)

[scordio]

Superseded by spring-projects/spring-batch-extensions#152.