Removed collection and lazy from storage

[xgreenx]

Moved to separate PR based on the comment.

[paritytech-cicd-pr]

🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑

These are the results when building the examples/* contracts from this branch with cargo-contract 1.3.0-cef152e and comparing them to ink! master:

	Δ Optimized Size	Δ Used Gas	Total Optimized Size	Total Used Gas
accumulator			1.04 K
adder			2.13 K
contract-introspection			2.37 K
contract-terminate			0.94 K	275_000
contract-transfer			8.13 K	75_000
data-structures			1.73 K
delegate-calls			2.96 K	76_276
delegator			6.38 K	232_281
dns			8.89 K	225_000
erc1155			17.30 K	450_000
erc20			8.49 K	225_000
erc721			11.82 K	600_000
flipper			1.31 K	75_000
forward-calls			2.88 K	151_427
incrementer			1.21 K
mother	-0.05 K		12.36 K
multisig	+0.18 K	+119	25.29 K	470_275
rand-extension			3.92 K	75_000
seal-code-hash			1.58 K
seal-ecdsa			1.81 K
set-code-hash			1.57 K	150_000
subber			2.15 K
trait-erc20			8.77 K	225_000
trait-flipper			1.00 K	75_000
trait-incrementer			1.19 K	150_000
updated-incrementer			9.62 K
upgradeable-flipper			1.55 K

Link to the run | Last update: Fri May 20 18:48:25 CEST 2022

[codecov-commenter]

Codecov Report

Merging #1271 (d9000e3) into master (3c267d6) will decrease coverage by 31.17%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1271       +/-   ##
===========================================
- Coverage   78.48%   47.31%   -31.18%     
===========================================
  Files         227      176       -51     
  Lines        8645     5916     -2729     
===========================================
- Hits         6785     2799     -3986     
- Misses       1860     3117     +1257     

Impacted Files	Coverage Δ
crates/storage/src/lazy/mapping.rs	54.28% <ø> (ø)
crates/storage/src/test_utils.rs	95.77% <ø> (-3.14%)	⬇️
crates/storage/src/traits/mod.rs	100.00% <ø> (ø)
crates/storage/src/traits/optspec.rs	85.71% <ø> (-7.39%)	⬇️
crates/lang/codegen/src/traits.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/ir/src/ir/contract.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/env.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/mod.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/enforced_error.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/lang/codegen/src/generator/blake2b.rs	0.00% <0.00%> (-100.00%)	⬇️
... and 48 more

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[HCastano]

Thanks!