Refactor crate features for more control over hash-maps usage

[Robbepop]

This allows to drop some wasmi_collections dependencies when unused for improved compile times.

Usage

Wasmi users who previously used no-hash-maps should simply use prefer-btree-collections now instead to make sure to always use btree-based collections in their compiled artifacts.

Summary

• Removes no-hash-maps crate feature. Also remove it from default feature set.
• Adds hash-collections crate feature.
• Adds prefer-btree-collections crate feature.

Feature/collections usage matrix:

hash-collections	prefer-btree-collections	usage
false	false	btree (default)
true	false	hash
false	true	btree
true	true	btree

Similar to: https://github.com/bytecodealliance/wasm-tools/pull/1866/files
Will be even more useful once #1141 has been merged.

Benchmarks

	Before	After
Compiled Crates	22	15
Build Time (dev)	5.8s	5.5s
Build Time (release)	7.9s	7.7s

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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