Release 0.29.0

[eddelbuettel]

This PR formalises release 0.29.0 (submitted to CRAN). From NEWS.md (with 'lowered' headline levels for display here):

tiledb 0.29.0

• This release of the R package builds against TileDB 2.25.0, and has also been tested against earlier releases as well as the development version (#728, #736)

Improvements

• Three deprecated calls to dump() methods for TileDB Embedded objects now use the preferred streaming alternatives (#727)

• Two already deprecated functions that are removed in TileDB 2.26.0 are no longer used (#732)

• The vendored nanoarrow has been updated to its release 0.5.0 (#733)

• Fragments can now be removed by supplying a vector of fragment URIs (#734)

• NDRectangle and CurrentDomain objects are supported (with 2.25.0 or newer) and can be used with ArraySchema and ArraySchemeEvolution domain of (#735, #737)

Build and Test Systems

• The nighly valgrind matrix now includes release 2.25.0 (#729)

[eddelbuettel]

Thanks for the approval, @awenocur. Proceeding as usual with a second commit for updated pkgdown docs. By now the package has reached CRAN too: