Remove compile_as_dependency config option

[HCastano]

This PR removes the compile_as_dependency configuration option on the main
ink::contract macro. The rational here is that this is an option which isn't really
needed/used and removing it simplifes the ink! language a bit.

This functionality isn't needed since we can achieve the same result with the
ink-as-dependency crate feature.

As an additional argument for removing it, quoting the old docs:

The author is not aware of any particular practical use case for users that
makes use of this flag but contract writers are encouraged to disprove this.

This was split out from #1163.

[paritytech-cicd-pr]

🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑

These are the results when building the examples/* contracts from this branch with cargo-contract 0.17.0-536caf5 and comparing them to ink! master:

	Δ Optimized Size	Δ Used Gas	Total Optimized Size	Total Used Gas
accumulator			1.13 K
adder			2.13 K
contract-introspection			2.38 K
contract-terminate			0.94 K	214_418
contract-transfer			8.15 K	14_418
delegator			6.11 K	46_471
dns			9.39 K	43_254
erc1155			27.23 K	86_508
erc20			8.95 K	43_254
erc721			13.27 K	115_344
flipper			1.41 K	14_418
incrementer			1.30 K	14_418
multisig			25.86 K	93_983
proxy			3.12 K	29_555
rand-extension			4.21 K	14_418
subber			2.15 K
trait-erc20			9.23 K	43_254
trait-flipper			1.10 K	14_418
trait-incrementer			1.27 K	28_836

Link to the run | Last update: Tue Mar 8 05:34:10 CET 2022

[codecov-commenter]

Codecov Report

Merging #1168 (62cb20e) into master (776df42) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1168      +/-   ##
==========================================
+ Coverage   78.46%   78.60%   +0.13%     
==========================================
  Files         231      229       -2     
  Lines        8747     8715      -32     
==========================================
- Hits         6863     6850      -13     
+ Misses       1884     1865      -19     

Impacted Files	Coverage Δ
...es/lang/codegen/src/generator/as_dependency/mod.rs	100.00% <ø> (+33.33%)	⬆️
crates/lang/codegen/src/generator/dispatch.rs	94.49% <ø> (-0.03%)	⬇️
crates/lang/codegen/src/generator/metadata.rs	97.36% <ø> (-0.03%)	⬇️
crates/lang/codegen/src/generator/mod.rs	100.00% <ø> (ø)
crates/lang/ir/src/ast/attr_args.rs	82.60% <ø> (ø)
crates/lang/ir/src/ir/contract.rs	100.00% <ø> (ø)
crates/lang/macro/src/lib.rs	100.00% <ø> (ø)
crates/lang/src/env_access.rs	12.00% <ø> (ø)
crates/lang/ir/src/ir/config.rs	96.49% <100.00%> (+0.96%)	⬆️
...ates/storage/src/collections/hashmap/fuzz_tests.rs	100.00% <0.00%> (+4.25%)	⬆️

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[ascjones]

LGTM