Remove hack and insist on Julia version upgrade

[willtebbutt]

In #377 we introduced a hack which ensured that code was loaded in roughly the correct order when extensions depended upon other extensions. Happily this ceased to be necessary in 1.11.2, so this PR

1. removes the hacky code
2. modifies the Julia compat bound to ensure that people still running 1.11.0 or 1.11.1 do not see this problem.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

[yebai]

I think you can also move FunctionWrappers to weakdeps now.

[willtebbutt]

Good point -- I'll give that a try.

edit: I'll give that a try in a follow-up PR.

[github-actions]

Performance Ratio:
Ratio of time to compute gradient and time to compute function.
Warning: results are very approximate! See here for more context.

┌────────────────────────────┬──────────┬─────────┬─────────────┬─────────┐
│                      Label │ Mooncake │  Zygote │ ReverseDiff │  Enzyme │
│                     String │   String │  String │      String │  String │
├────────────────────────────┼──────────┼─────────┼─────────────┼─────────┤
│                   sum_1000 │     70.9 │     1.0 │         5.7 │ missing │
│                  _sum_1000 │     6.69 │  1360.0 │        34.2 │ missing │
│               sum_sin_1000 │     2.25 │    1.69 │        10.4 │ missing │
│              _sum_sin_1000 │     2.71 │   264.0 │        13.5 │ missing │
│                   kron_sum │     81.5 │    4.13 │       259.0 │ missing │
│              kron_view_sum │     57.1 │    9.43 │       208.0 │ missing │
│      naive_map_sin_cos_exp │     2.52 │ missing │        7.41 │ missing │
│            map_sin_cos_exp │     2.75 │    1.51 │        5.98 │ missing │
│      broadcast_sin_cos_exp │     2.58 │    3.06 │        1.46 │ missing │
│                 simple_mlp │     3.15 │    1.32 │        6.63 │ missing │
│                     gp_lml │     4.63 │    2.27 │     missing │ missing │
│ turing_broadcast_benchmark │      3.3 │ missing │        24.8 │ missing │
│         large_single_block │     4.03 │  4380.0 │        30.3 │ missing │
└────────────────────────────┴──────────┴─────────┴─────────────┴─────────┘