Preparation of pushforward, pullback and hvp for same point x

[gdalle]

• Bump DI and DIT to v0.4.0

Core

BREAKING

• Remove split reverse mode with value_and_pullback_split

NON-BREAKING

• Add functions for preparation of a product-based differentiation operator when the point x doesn't change:
  • prepare_pushforward_same_point
  • prepare_pullback_same_point
  • prepare_hvp_same_point
• Make same-point preparation fall back on normal preparation
• Use same-point preparation step after normal preparation in Jacobian and Hessian, both sparse and dense
• Avoid running actual differentiation in the preparation of a sparse Jacobian / Hessian
• Use prepare_pullback_same_point when pushforward falls back on pullback
• Add @eval fallbacks for AutoSparse

Tests

• Test correctness for both extras and extras_same
• Remove mysimilar_random and replace it with mycopy_random for test initializations (the latter preserves SArray, the former spits out a MArray instead)

Extensions

• Adjust DifferentiateWith in the ChainRules extension
• Replace split reverse mode with prepare_pullback_same_point for ChainRules, Tracker and Zygote
• Use similar when initializing storage in ForwardDiff's pushforward, so that SArray is supported

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.78135% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 95.13%. Comparing base (8843031) to head (5cb4d12).

Files	Patch %	Lines
...ferentiationInterfaceTest/src/tests/correctness.jl	76.54%	38 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #255      +/-   ##
==========================================
- Coverage   95.44%   95.13%   -0.31%     
==========================================
  Files          74       74              
  Lines        3948     3929      -19     
==========================================
- Hits         3768     3738      -30     
- Misses        180      191      +11     

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