[WIP] Deny OOM, embrace `try_reserve`

[VictorKoenders]

With Rust 1.57, several try_reserve methods have been stabilized. This PR makes bincode take advantage of this.

A nightly flag can be set to disable all fallible allocations. This is currently blocked on the following features:

• [ ] allocator_api tracking issue
  • [ ] Arc::try_new
  • [ ] Rc::try_new
  • [ ] Box::try_new_uninit_slice
  • [ ] AllocError
• [ ] new_uninit tracking issue
• [x] try_reserve on more collections: tracking issue

And uses the following features, although this could be implemented manually:

• [ ] maybe_uninit_slice tracking issue
• [x] vec_spare_capacity tracking issue (stabilized on jan 18, 2022)

Other useful issues:

• [ ] Vec::push_within_capacity to reduce the amount of unsafe code to replace Vec::push tracking issue

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.36986% with 71 lines in your changes are missing coverage. Please review.

Project coverage is 57.05%. Comparing base (e7dff9d) to head (c4e11a1). Report is 2 commits behind head on trunk.

Files	Patch %	Lines
src/features/impl_alloc.rs	53.43%	61 Missing :warning:
src/error.rs	0.00%	5 Missing :warning:
src/features/impl_std.rs	50.00%	2 Missing :warning:
src/features/serde/mod.rs	0.00%	2 Missing :warning:
src/features/serde/de_borrowed.rs	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk     #448      +/-   ##
==========================================
- Coverage   57.21%   57.05%   -0.16%     
==========================================
  Files          51       51              
  Lines        4410     4427      +17     
==========================================
+ Hits         2523     2526       +3     
- Misses       1887     1901      +14     

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[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[gimbling-away]

Forgot a closing paren there in the PR description?