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Part 2 of RFC2906 -- allow inheriting from a different `Cargo.toml`

Tracking issue: #8415
RFC: rust-lang/rfcs#2906

[Part 1](#10497)

This PR focuses on inheriting from a root workspace:
- Allow inheriting from a different `Cargo.toml`
- Add in searching for a workspace root in `to_real_manifest` as needed
- Fixed problem where a package would try to pull a dependency from a workspace and specify `{ workspace = true, optional = true }` and it would not respect the `optional`
- Added tests to verify everything is in working order

Remaining implementation work for the RFC
- Correctly inherit fields that are relative paths
  - Including adding support for inheriting `license_file`,  `readme`, and path-dependencies
-  Path dependencies infer version directive
- Lock workspace dependencies and warn when unused
- Optimizations, as needed
- Evaluate any new fields for being inheritable (e.g. `rust-version`)

Problems:
- There is duplication of code that can't be removed without significant refactoring
- Potential to parse the same manifest many times when searching for a root
  - This should not happen when a `[package]` specifies its workspace
  - This should only happen if the workspace root is greater than one folder above
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Cargo

Cargo downloads your Rust project’s dependencies and compiles your project.

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First, you'll want to check out this repository

git clone https://github.com/rust-lang/cargo
cd cargo

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