chore: get rid of implicit imports and clarify extension imports

[gdalle]

Versions

• Bump DI to v0.6.24
• Bump DIT to v0.9.1

DI extensions

• Make DiffResults an explicit dependency of the ForwardDiff and ReverseDiff extensions
• Remove implicit imports
• Prefix every DI object with DI

DIT source and extensions

• Remove implicit imports

DI and DIT tests

• Add / activate ExplicitImports tests

[codecov]

Codecov Report

Attention: Patch coverage is 98.92086% with 3 lines in your changes missing coverage. Please review.

Project coverage is 97.52%. Comparing base (fd3dc14) to head (c603214).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...ractorExt/DifferentiationInterfaceDiffractorExt.jl	0.00%	2 Missing ⚠️
...erentiationInterfaceTest/src/scenarios/scenario.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #649   +/-   ##
=======================================
  Coverage   97.52%   97.52%           
=======================================
  Files         111      111           
  Lines        5536     5536           
=======================================
  Hits         5399     5399           
  Misses        137      137           

Flag	Coverage Δ
DI	98.65% <99.23%> (ø)
DIT	95.35% <93.75%> (ø)

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