Remove Wasmtime dependency from wasmi_wasi crate

[Robbepop]

Closes #561.

Unfortunately wiggle version 1.0.2 is the most recent version that is Wasm runtime agnostic. All later major wiggle versions starting with wiggle version 2.0.0 and up and therefore also all later wasi-common version (since wasi-common builds on top of wiggle) are directly depending on Wasmtime.
Therefore a downgrade from version 2.0.0 to version 1.0.0 was necessary to fix this issue for wasmi.

In the long run we (wasmi team) might have to ship our own WASI implementation or find an alternative solution since we do not want us to depend on Wasmtime or any other Wasm runtime.

[paritytech-cicd-pr]

BENCHMARKS

	NATIVE			WASMTIME
BENCHMARK	MASTER	PR	DIFF	MASTER	PR	DIFF	WASMTIME OVERHEAD
execute/ bare_call_0	1.01ms	1.01ms	⚪ -0.10%	976.88µs	947.90µs	🟢 -2.99%	🟢 -6%
execute/ bare_call_0/typed	527.67µs	527.48µs	⚪ 0.11%	405.88µs	399.71µs	🟢 -1.50%	🟢 -24%
execute/ bare_call_1	1.07ms	1.06ms	🟢 -0.44%	1.15ms	1.16ms	🟢 1.16%	🟢 10%
execute/ bare_call_16	2.15ms	2.23ms	🟢 1.30%	4.81ms	4.73ms	🟢 -1.73%	🔴 112%
execute/ bare_call_16/typed	1.57ms	1.40ms	🟢 -11.05%	2.17ms	1.97ms	🟢 -9.01%	🟢 41%
execute/ bare_call_1/typed	610.36µs	609.41µs	⚪ -0.11%	710.96µs	683.85µs	🟢 -3.97%	🟢 12%
execute/ bare_call_4	1.19ms	1.19ms	⚪ 0.14%	1.75ms	1.71ms	🟢 -2.03%	🟢 44%
execute/ bare_call_4/typed	621.24µs	620.40µs	⚪ 0.25%	816.75µs	807.30µs	⚪ -1.17%	🟢 30%
execute/ br_table	626.02µs	629.32µs	⚪ 0.95%	978.45µs	880.66µs	🟢 -9.95%	🟢 40%
execute/ count_until	1.19ms	652.18µs	🟢 -45.00%	2.06ms	2.01ms	🟢 -2.55%	🔴 208%
execute/ factorial_iterative	304.42µs	303.52µs	⚪ -0.35%	847.08µs	846.72µs	⚪ -0.02%	🔴 179%
execute/ factorial_recursive	609.07µs	633.73µs	🔴 4.01%	1.25ms	1.26ms	⚪ 0.84%	🟡 99%
execute/ fib_iterative	1.44ms	1.43ms	⚪ -0.14%	4.46ms	4.50ms	⚪ 0.74%	🔴 214%
execute/ fib_recursive	5.75ms	5.82ms	🔴 1.26%	11.28ms	11.35ms	⚪ 0.70%	🟡 95%
execute/ global_bump	949.12µs	949.65µs	⚪ 0.02%	3.18ms	3.12ms	🟢 -1.52%	🔴 229%
execute/ global_const	718.52µs	725.83µs	⚪ 0.98%	2.32ms	2.42ms	🔴 3.57%	🔴 233%
execute/ host_calls	28.96µs	32.27µs	🔴 11.55%	39.31µs	39.97µs	🔴 1.63%	🟢 24%
execute/ memory_fill	1.29ms	1.28ms	⚪ -0.74%	4.00ms	3.90ms	🟢 -2.46%	🔴 205%
execute/ memory_sum	1.26ms	1.25ms	⚪ -0.80%	3.96ms	3.93ms	⚪ -0.84%	🔴 214%
execute/ memory_vec_add	2.68ms	2.68ms	⚪ -0.09%	8.20ms	8.27ms	⚪ 1.05%	🔴 209%
execute/ recursive_is_even	1.16ms	1.11ms	🟢 -3.64%	2.24ms	2.10ms	🟢 -6.31%	🟡 89%
execute/ recursive_ok	146.95µs	145.74µs	⚪ -1.59%	299.14µs	293.55µs	🟢 -2.02%	🔴 101%
execute/ recursive_scan	189.90µs	178.91µs	🟢 -5.64%	377.29µs	370.26µs	🟢 -1.81%	🔴 107%
execute/ recursive_trap	14.97µs	14.36µs	🟢 -4.06%	29.28µs	29.98µs	🔴 2.34%	🔴 109%
execute/ regex_redux	550.92µs	545.63µs	⚪ -0.18%	1.46ms	1.40ms	🟢 -4.19%	🔴 156%
execute/ rev_complement	506.49µs	509.59µs	⚪ 0.79%	1.43ms	1.39ms	🟢 -3.12%	🔴 172%
execute/ tiny_keccak	375.04µs	374.00µs	⚪ -0.15%	1.23ms	1.15ms	🟢 -6.76%	🔴 207%
execute/ trunc_f2i	919.47µs	917.50µs	⚪ -0.26%	2.43ms	2.37ms	🟢 -2.28%	🔴 159%
instantiate/ wasm_kernel	58.60µs	60.79µs	🔴 2.98%	95.70µs	68.11µs	🟢 -28.62%	🟢 12%
translate/ erc1155	204.74µs	206.31µs	⚪ 0.72%	379.43µs	377.29µs	⚪ -0.81%	🟡 83%
translate/ erc20	101.49µs	101.09µs	⚪ -0.37%	184.71µs	186.70µs	🔴 1.25%	🟡 85%
translate/ erc721	144.98µs	145.61µs	⚪ 0.09%	270.62µs	269.18µs	⚪ -0.53%	🟡 85%
translate/ spidermonkey	0.00ns	0.00ns	⚪ -0.38%	0.00ns	0.00ns	⚪ -0.35%	🟢 0%
translate/ wasm_kernel	3.88ms	3.86ms	⚪ -0.21%	7.08ms	7.05ms	⚪ -0.41%	🟡 83%

Link to pipeline

[codecov-commenter]

Codecov Report

Merging #563 (23c9f2e) into master (23df536) will decrease coverage by 0.03%.
The diff coverage is 68.42%.

@@            Coverage Diff             @@
##           master     #563      +/-   ##
==========================================
- Coverage   80.07%   80.03%   -0.04%     
==========================================
  Files          77       78       +1     
  Lines        6304     6322      +18     
==========================================
+ Hits         5048     5060      +12     
- Misses       1256     1262       +6     

Impacted Files	Coverage Δ
crates/wasi/src/guest_memory.rs	66.66% <66.66%> (ø)
crates/wasi/src/snapshots/preview_1.rs	81.25% <100.00%> (ø)

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