FFI: no more __unstable__ wasm import module

[agryaznov]

Follow-up to substrate#12781: there's no __unstable__ module anymore

[codecov-commenter]

Codecov Report

Merging #1522 (7596df3) into master (dc62b4f) will decrease coverage by 6.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1522      +/-   ##
==========================================
- Coverage   71.72%   65.10%   -6.62%     
==========================================
  Files         204      204              
  Lines        6316     6314       -2     
==========================================
- Hits         4530     4111     -419     
- Misses       1786     2203     +417     

Impacted Files	Coverage Δ
crates/ink/ir/src/ir/contract.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/ink/ir/src/ir/ink_test.rs	0.00% <0.00%> (-87.50%)	⬇️
crates/ink/ir/src/ir/trait_def/mod.rs	0.00% <0.00%> (-81.82%)	⬇️
crates/ink/ir/src/ir/storage_item/mod.rs	0.00% <0.00%> (-73.92%)	⬇️
crates/ink/ir/src/ir/storage_item/config.rs	0.00% <0.00%> (-73.34%)	⬇️
crates/ink/ir/src/ir/blake2.rs	20.83% <0.00%> (-58.34%)	⬇️
crates/ink/ir/src/ir/trait_def/config.rs	7.14% <0.00%> (-57.15%)	⬇️
crates/ink/ir/src/ir/trait_def/item/trait_item.rs	45.90% <0.00%> (-45.91%)	⬇️
crates/ink/ir/src/ir/config.rs	64.00% <0.00%> (-36.00%)	⬇️
crates/ink/ir/src/ir/utils.rs	57.40% <0.00%> (-35.19%)	⬇️
... and 20 more

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[athei]

Can you add some docs to the imported function and the user facing Mapping::take to warn about the instability? You can link to the pallet-contracts README sub section describing unstable from there, too.