Refactor, cleanup and optimize Wasm module instantiation

[Robbepop]

• Preallocates buffers upon Module instantiation to reduce amount of copying and reallocations.
• Uses more dense data structures for Instance, e.g. Box<[T]> instead of Vec<T> or Box<str> instead of String.
• Removes lifetime parameter from InstancePre.
• No longer copies over the contents of the Module's func_types upon instantiation but efficiently clones via ref counting.

[paritytech-cicd-pr]

BENCHMARKS

	NATIVE			WASMTIME
BENCHMARK	MASTER	PR	DIFF	MASTER	PR	DIFF	WASMTIME OVERHEAD
execute/ bare_call_0	1.27ms	1.26ms	⚪ -0.78%	1.11ms	1.09ms	🔴 -1.47%	🟢 -13%
execute/ bare_call_0/typed	724.61µs	698.24µs	⚪ -2.76%	531.17µs	554.75µs	🔴 4.35%	🟢 -21%
execute/ bare_call_1	1.40ms	1.41ms	🔴 0.28%	1.41ms	1.35ms	🟢 -4.21%	🟢 -4%
execute/ bare_call_16	2.98ms	2.93ms	🔴 -1.93%	5.14ms	5.00ms	🟢 -2.74%	🟡 71%
execute/ bare_call_16/typed	1.28ms	1.43ms	🔴 10.31%	2.36ms	2.28ms	🟢 -3.54%	🟡 60%
execute/ bare_call_1/typed	804.56µs	809.31µs	⚪ 0.66%	876.48µs	874.58µs	⚪ -0.28%	🟢 8%
execute/ bare_call_4	1.75ms	1.73ms	🔴 -0.78%	2.17ms	2.13ms	🟢 -1.72%	🟢 23%
execute/ bare_call_4/typed	888.87µs	903.88µs	🔴 1.61%	987.02µs	979.43µs	⚪ -0.74%	🟢 8%
execute/ br_table	914.96µs	939.52µs	🔴 2.71%	1.10ms	1.12ms	🔴 1.24%	🟢 19%
execute/ count_until	903.18µs	903.14µs	⚪ 0.06%	2.33ms	2.27ms	🟢 -2.63%	🔴 151%
execute/ factorial_iterative	363.66µs	363.85µs	⚪ 0.07%	928.88µs	939.46µs	🔴 1.14%	🔴 158%
execute/ factorial_recursive	720.16µs	726.86µs	⚪ 0.91%	1.60ms	1.51ms	🟢 -5.84%	🔴 108%
execute/ fib_iterative	1.79ms	1.79ms	⚪ -0.11%	5.02ms	5.22ms	🔴 3.90%	🔴 192%
execute/ fib_recursive	8.17ms	6.92ms	🟢 -15.17%	15.22ms	14.10ms	🟢 -7.38%	🔴 104%
execute/ global_bump	1.36ms	1.36ms	⚪ -0.08%	3.63ms	3.55ms	🟢 -2.03%	🔴 161%
execute/ host_calls	32.73µs	36.24µs	🔴 10.50%	44.34µs	44.17µs	⚪ -0.34%	🟢 22%
execute/ memory_fill	1.55ms	1.55ms	⚪ -0.06%	4.22ms	4.14ms	🟢 -2.00%	🔴 166%
execute/ memory_sum	1.55ms	1.55ms	⚪ 0.06%	4.24ms	4.38ms	🔴 3.15%	🔴 183%
execute/ memory_vec_add	3.05ms	3.05ms	⚪ 0.03%	8.63ms	8.66ms	⚪ 0.34%	🔴 184%
execute/ recursive_is_even	1.30ms	1.31ms	⚪ 0.58%	2.59ms	2.58ms	⚪ -0.18%	🟡 97%
execute/ recursive_ok	172.16µs	172.23µs	⚪ 0.02%	360.95µs	360.88µs	⚪ 0.00%	🔴 110%
execute/ recursive_scan	215.32µs	214.58µs	⚪ -0.37%	466.80µs	462.25µs	⚪ -0.94%	🔴 115%
execute/ recursive_trap	17.20µs	17.13µs	⚪ -0.40%	36.15µs	36.06µs	⚪ -0.21%	🔴 111%
execute/ regex_redux	675.18µs	671.05µs	⚪ -0.55%	1.60ms	1.59ms	⚪ -0.74%	🔴 137%
execute/ rev_complement	591.66µs	586.28µs	⚪ -0.91%	1.53ms	1.54ms	⚪ 0.05%	🔴 162%
execute/ tiny_keccak	468.22µs	468.83µs	⚪ 0.23%	1.44ms	1.36ms	🟢 -5.20%	🔴 191%
execute/ trunc_f2i	1.08ms	1.02ms	🟢 -5.36%	2.64ms	2.57ms	🟢 -2.94%	🔴 152%
instantiate/ wasm_kernel	73.26µs	73.12µs	⚪ 0.32%	121.12µs	93.57µs	🟢 -22.90%	🟢 28%
translate/ wasm_kernel	4.15ms	4.13ms	⚪ -0.64%	7.91ms	7.73ms	🟢 -2.48%	🟡 87%

Link to pipeline