Optimize get property for most primitive types

[Robbepop]

Implements #972.

The main trick in this PR is that we "trust" SEAL in that it delivers correct inputs to ink! result buffers for functions like seal_caller.
Before this PR we additionally "checked" the given values by decoding them. Now we simply take their bit patterns directly.

This has turned many of the property functions into infallible functions.

Benchmarks

• ERC-1155: 49.3 kB -> 49.1 kB
• Trait-ERC-20: 29.3kB -> 29.1kB

Savings are not huge but go into the right direction.

[codecov-commenter]

Codecov Report

Merging #974 (06d333e) into master (ee9015d) will decrease coverage by 15.15%.
The diff coverage is 5.88%.

@@             Coverage Diff             @@
##           master     #974       +/-   ##
===========================================
- Coverage   78.97%   63.81%   -15.16%     
===========================================
  Files         244      244               
  Lines        9122     9148       +26     
===========================================
- Hits         7204     5838     -1366     
- Misses       1918     3310     +1392     

Impacted Files	Coverage Δ
crates/env/src/backend.rs	0.00% <ø> (ø)
...tes/env/src/engine/experimental_off_chain/impls.rs	55.23% <0.00%> (-1.08%)	⬇️
crates/env/src/engine/off_chain/tests.rs	100.00% <ø> (ø)
crates/env/src/types.rs	22.22% <0.00%> (-22.23%)	⬇️
crates/lang/macro/src/lib.rs	100.00% <ø> (ø)
crates/lang/src/codegen/dispatch/execution.rs	0.00% <0.00%> (ø)
crates/lang/src/env_access.rs	12.00% <0.00%> (ø)
crates/env/src/api.rs	36.36% <11.11%> (ø)
crates/env/src/engine/off_chain/impls.rs	42.98% <11.11%> (-4.24%)	⬇️
crates/lang/codegen/src/traits.rs	0.00% <0.00%> (-100.00%)	⬇️
... and 45 more

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[athei]

Makes total sense to me. No need to bubble this up to the poor user. Those should be infallible.