v0.29.0

Turing v0.29.0

Diff since v0.28.3

Closed issues:

• How to conduct Bayesian inference using an existing posterior samples as new prior distribution, as well as new observations in Turing? (#2069)

Merged pull requests:

• Reorganised some files. (#2055) (@yebai)
• Remove some obsolete utility exports. (#2070) (@yebai)
• Remove usage of DynamicPPL.tonamedtuple (#2071) (@torfjelde)
• FlattenIterator is replaced by varname_and_value_leaves (#2072) (@yebai)
• rename a few folders for clarity (#2073) (@yebai)
• Remove redundant docs link (#2075) (@willtebbutt)
• Tracker imports no longer needed. (#2076) (@yebai)