Merge branch 'bpf: __bpf_dynptr_data* and __str annotation'

Song Liu says:

====================
This set contains the first 3 patches of set [1]. Currently, [1] is waiting
for [3] to be merged to bpf-next tree. So send these 3 patches first to
unblock other works, such as [2]. This set is verified with new version of
[1] in CI run [4].

Changes since v12 of [1]:
1. Reuse bpf_dynptr_slice() in __bpf_dynptr_data(). (Andrii)
2. Add Acked-by from Vadim Fedorenko.

[1] https://lore.kernel.org/bpf/[email protected]/
[2] https://lore.kernel.org/bpf/[email protected]/
[3] https://lore.kernel.org/bpf/[email protected]/
[4] https://github.com/kernel-patches/bpf/actions/runs/6779945063/job/18427926114
====================

Signed-off-by: Andrii Nakryiko <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>

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