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#### Overview:

This PR enables more aggressive compiler optimizations for the project which should lead to better performance and smaller binary sizes.

In this PR, I decided to use Fat LTO instead of ThinLTO since it provides higher optimization level.

I have made quick tests (AMD Ryzen 5900x, Fedora 41, Rust 1.85.1, the latest version of the project at the moment, `cargo build --release` command) - here are the results about the binary size improvements.

| Binary\Build mode | dynamo-run | libdynamo_llm_capi.so | http | llmctl | metrics | mock_worker |
| --- | --- | --- | --- | --- | --- | --- |
| Release | 55 Mib | 14 Mib | 19 Mib | 14 Mib | 21 Mib | 14 Mib |
| Release + `codegen-units = 1` + ThinLTO | 43 Mib | 11 Mib | 15 Mib | 11 Mib | 17 Mib | 11 Mib |
| Release + `codegen-units = 1` + FatLTO | 38 Mib | 9.2 Mib | 13 Mib | 9.6 Mib | 15 Mib | 9.6 Mib |

#### Details:

Enable `codegen-units = 1` and Fat LTO for better optimizations.

#### Where should the reviewer start?

Just check the `Cargo.toml` file ;)

#### Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

- closes GitHub issue: #278 

- Mac doesn't have `pipe2` syscall so use plain `pipe`.
- rtnetlink isn't a dependency on mac so don't use the type

Co-authored-by: Meenakshi Sharma <163925564+nvda-mesharma@users.noreply.github.com>

Co-authored-by: Harrison Saturley-Hall <454891+saturley-hall@users.noreply.github.com>
Co-authored-by: Harrison King Saturley-Hall <hsaturleyhal@nvidia.com>

Co-authored-by: Biswa Panda <biswa.panda@gmail.com>

Co-authored-by: Graham King <grahamk@nvidia.com>

Signed-off-by: Neelay Shah <neelays@nvidia.com>
Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Signed-off-by: Ryan Olson <ryanolson@users.noreply.github.com>
Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Signed-off-by: Ryan Olson <ryanolson@users.noreply.github.com>
Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Signed-off-by: Ryan Olson <ryanolson@users.noreply.github.com>
Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>
Co-authored-by: Neelay Shah <neelays@nvidia.com>

Co-authored-by: aflowers <aflowers@nvidia.com>

Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>
Co-authored-by: Neelay Shah <neelays@nvidia.com>

the journey begins