Create a non-generic StoreInner

[Robbepop]

This might be useful to make the engine's executor non-generic. A non-generic engine executor is important to decrease bloat but also to make use of the experimental #[union_fn] data structure.

[paritytech-cicd-pr]

BENCHMARKS

	NATIVE			WASMTIME
BENCHMARK	MASTER	PR	DIFF	MASTER	PR	DIFF	WASMTIME OVERHEAD
execute/ bare_call_0	1.34ms	1.35ms	🟢 0.90%	1.16ms	1.12ms	🟢 -3.47%	🟢 -17%
execute/ bare_call_0/typed	1.07ms	1.03ms	🟢 -4.06%	743.90µs	726.59µs	🟢 -2.34%	🟢 -29%
execute/ bare_call_1	1.42ms	1.43ms	🔴 1.41%	1.45ms	1.51ms	🔴 3.87%	🟢 6%
execute/ bare_call_16	2.46ms	2.36ms	🟢 -4.73%	4.29ms	4.44ms	🔴 3.64%	🟡 88%
execute/ bare_call_16/typed	1.64ms	1.56ms	🟢 -5.23%	2.31ms	2.65ms	🔴 15.03%	🟡 71%
execute/ bare_call_1/typed	1.07ms	1.10ms	🔴 2.90%	1.14ms	1.13ms	⚪ 0.00%	🟢 3%
execute/ bare_call_4	1.61ms	1.73ms	🔴 7.11%	2.00ms	2.18ms	🔴 9.16%	🟢 26%
execute/ bare_call_4/typed	1.16ms	1.11ms	🟢 -4.72%	1.22ms	1.21ms	⚪ -0.35%	🟢 10%
execute/ br_table	1.08ms	1.10ms	⚪ 2.06%	1.35ms	1.45ms	🔴 8.14%	🟢 32%
execute/ count_until	710.06µs	683.76µs	🟢 -3.77%	2.24ms	2.85ms	🔴 27.12%	🔴 317%
execute/ factorial_iterative	320.33µs	327.74µs	🔴 2.18%	941.82µs	1.22ms	🔴 29.55%	🔴 272%
execute/ factorial_recursive	634.91µs	641.20µs	⚪ 1.04%	1.67ms	1.51ms	🟢 -9.12%	🔴 136%
execute/ fib_iterative	1.46ms	1.43ms	🟢 -1.51%	4.87ms	6.51ms	🔴 33.57%	🔴 354%
execute/ fib_recursive	6.17ms	5.80ms	🟢 -6.37%	15.45ms	13.97ms	🟢 -9.62%	🔴 141%
execute/ global_bump	1.10ms	978.30µs	🟢 -11.18%	3.38ms	3.43ms	⚪ 1.24%	🔴 250%
execute/ global_const	719.51µs	718.79µs	⚪ -0.11%	2.58ms	3.22ms	🔴 25.13%	🔴 348%
execute/ host_calls	29.36µs	28.90µs	🟢 -1.58%	46.08µs	45.00µs	🟢 -2.36%	🟡 56%
execute/ memory_fill	1.35ms	1.34ms	⚪ -0.97%	4.27ms	5.18ms	🔴 21.60%	🔴 288%
execute/ memory_sum	1.32ms	1.31ms	⚪ -0.92%	4.30ms	5.29ms	🔴 23.72%	🔴 304%
execute/ memory_vec_add	2.83ms	2.74ms	🟢 -2.89%	9.06ms	10.37ms	🔴 14.49%	🔴 278%
execute/ recursive_is_even	1.13ms	1.14ms	⚪ 0.81%	2.86ms	2.36ms	🟢 -17.33%	🔴 107%
execute/ recursive_ok	149.59µs	151.64µs	🔴 1.46%	373.07µs	326.80µs	🟢 -12.37%	🔴 116%
execute/ recursive_scan	181.16µs	181.78µs	⚪ 0.44%	465.96µs	435.99µs	🟢 -6.33%	🔴 140%
execute/ recursive_trap	14.39µs	14.59µs	⚪ 1.63%	35.69µs	33.03µs	🟢 -7.60%	🔴 126%
execute/ regex_redux	573.78µs	561.83µs	🟢 -1.95%	1.77ms	1.79ms	⚪ 1.04%	🔴 218%
execute/ rev_complement	537.21µs	513.62µs	🟢 -3.63%	1.65ms	1.79ms	🔴 7.58%	🔴 248%
execute/ tiny_keccak	372.20µs	361.91µs	🟢 -2.62%	1.37ms	1.51ms	🔴 10.21%	🔴 317%
execute/ trunc_f2i	912.21µs	917.29µs	⚪ 0.75%	2.60ms	3.01ms	🔴 15.57%	🔴 228%
instantiate/ wasm_kernel	63.06µs	61.95µs	⚪ -3.01%	74.23µs	73.05µs	⚪ -1.22%	🟢 18%
translate/ erc1155	211.27µs	211.38µs	⚪ 0.32%	408.04µs	403.62µs	⚪ -1.08%	🟡 91%
translate/ erc20	102.87µs	103.26µs	⚪ 0.40%	198.21µs	200.37µs	🔴 1.38%	🟡 94%
translate/ erc721	148.98µs	147.88µs	⚪ -0.60%	290.22µs	289.25µs	⚪ -0.33%	🟡 96%
translate/ spidermonkey	0.00ns	0.00ns	⚪ 0.61%	0.00ns	0.00ns	⚪ -0.69%	🟢 0%
translate/ wasm_kernel	3.82ms	3.82ms	⚪ 0.56%	7.70ms	7.63ms	⚪ -0.81%	🟡 100%

Link to pipeline

[codecov-commenter]

Codecov Report

Merging #610 (18724aa) into master (cc05d72) will increase coverage by 0.08%.
The diff coverage is 94.62%.

@@            Coverage Diff             @@
##           master     #610      +/-   ##
==========================================
+ Coverage   80.98%   81.07%   +0.08%     
==========================================
  Files          82       82              
  Lines        6758     6789      +31     
==========================================
+ Hits         5473     5504      +31     
  Misses       1285     1285              

Impacted Files	Coverage Δ
crates/wasmi/src/store.rs	87.82% <94.62%> (+3.02%)	⬆️

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