JsonPath-like API to easily deserialize parts of a BSON document

RFC 9535:

• Name selector: .foo • !146 (merged)
  • Single-quoted • !146 (merged)
  • Double-quoted • !146 (merged)
  • Usual escape sequences
  • Hexadecimal escape sequence
• Index selector: [0] • !146 (merged)
  • Negative index • !165 (merged)
• Wildcard selector: [*] • !165 (merged)
• Slice selector: [1:7:2] • !165 (merged)
• Filter selector: [?<expr>] • !182 (merged)
• Function extension: length(@.foo)
• Multiple selectors: [*, 1:2:3] • !182 (merged)
• Descendants: ..[*, 1:2:3]