wk 0.6.0

• Fixed wk_affine_rescale() to apply the translate and scale
  operations in the correct order (#94).
• Add wk_handle_slice() and wk_chunk_map_feature() to support
  a chunk + apply workflow when working with large vectors (#101, #107).
• C and R code was rewritten to avoid materializing ALTREP vectors
  (#103, #109).
• Added a wk_crs_proj_definition() generic for foreign CRS objects
  (#110, #112).
• Added wk_crs_longlat() helper to help promote authority-compliant
  CRS choices (#112).
• Added wk_is_geodesic(), wk_set_geodesic(), and argument geodesic
  in wkt() and wkb() as a flag for objects whose edges must
  be interpolated along a spherical/ellipsoidal trajectory (#112).
• Added sf::st_geometry() and sf::st_sfc() methods for wk geometry
  vectors for better integration with sf (#113, #114).
• Refactored well-known text parser to be more reusable and faster
  (#115, #104).
• Minor performance enhancement for is.na() and validate_wk_wkb()
  when called on a very long wkb() vector (#117).
• Fixed issue with validate_wk_wkb() and validate_wk_wkt(), which failed
  for most valid objects (#119).
• Added wk_envelope() and wk_envelope_handler() to compute feature-wise
  bounding boxes (#120, #122).
• Fixed headers and tests to pass on big endian systems (#105, #122).
• Incorporated the geodesic attribute into vctrs methods, data frame
  columns, and bbox/envelope calculation (#124, #125).
• Fix as_xy() for nested data frames and geodesic objects (#126, #128).
• Remove deprecated wkb_problems(), wkt_problems(), wkb_format(),
  and wkt_format() (#129).
• wk_plot() is now an S3 generic (#130).