feat: make loader and uhyve non-default features

[mkroening]

This PR prepares for:

• feat(x86_64): add PVH boot support #2366

Currently, PVH is mutually exclusive with loader and uhyve and I don't think it is worth the effort to support multiple distinct start info structs at the same time. This PR makes loader and uhyve non-default features, so any start method needs to be opted into.

[github-actions]

Benchmark Results

Details

Benchmark	Current: 1ab8a3c	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	94.11 s	80.34 s	1.17 ❗
startup_benchmark File Size	0.78 MB	0.80 MB	0.98 ❗
Startup Time - 1 core	0.80 s (±0.01 s)	0.75 s (±0.02 s)	1.07 ❗
Startup Time - 2 cores	0.80 s (±0.02 s)	0.74 s (±0.02 s)	1.09 ❗
Startup Time - 4 cores	0.80 s (±0.02 s)	0.74 s (±0.02 s)	1.08 ❗
multithreaded_benchmark Build Time	91.66 s	82.11 s	1.12 ❗
multithreaded_benchmark File Size	0.88 MB	0.86 MB	1.03 ❗
Multithreaded Pi Efficiency - 2 Threads	66.07 % (±4.25 %)	85.89 % (±6.61 %)	0.77 ❗
Multithreaded Pi Efficiency - 4 Threads	39.11 % (±3.48 %)	43.43 % (±2.56 %)	0.90 ❗
Multithreaded Pi Efficiency - 8 Threads	19.22 % (±1.51 %)	25.76 % (±1.53 %)	0.75 ❗
micro_benchmarks Build Time	211.36 s	80.40 s	2.63 ❗
micro_benchmarks File Size	0.89 MB	0.86 MB	1.03 ❗
Scheduling time - 1 thread	186.85 ticks (±35.97 ticks)	62.65 ticks (±4.06 ticks)	2.98 ❗
Scheduling time - 2 threads	111.44 ticks (±20.78 ticks)	34.08 ticks (±4.10 ticks)	3.27 ❗
Micro - Time for syscall (getpid)	11.43 ticks (±4.43 ticks)	3.45 ticks (±0.58 ticks)	3.31 ❗
Memcpy speed - (built_in) block size 4096	55778.79 MByte/s (±39993.83 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	0.68
Memcpy speed - (built_in) block size 1048576	12941.90 MByte/s (±10425.06 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	0.42
Memcpy speed - (built_in) block size 16777216	11091.85 MByte/s (±9081.54 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	0.42
Memset speed - (built_in) block size 4096	55961.62 MByte/s (±40112.92 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	0.68
Memset speed - (built_in) block size 1048576	13124.68 MByte/s (±10524.59 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	0.42
Memset speed - (built_in) block size 16777216	11327.68 MByte/s (±9196.60 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	0.42
Memcpy speed - (rust) block size 4096	51886.48 MByte/s (±37027.97 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	0.70
Memcpy speed - (rust) block size 1048576	16088.48 MByte/s (±14555.92 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	0.53
Memcpy speed - (rust) block size 16777216	12984.09 MByte/s (±11280.94 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	0.47
Memset speed - (rust) block size 4096	53187.31 MByte/s (±37550.25 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	0.72
Memset speed - (rust) block size 1048576	16416.52 MByte/s (±14676.56 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	0.53
Memset speed - (rust) block size 16777216	13215.10 MByte/s (±11368.71 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	0.47
alloc_benchmarks Build Time	211.84 s	74.76 s	2.83 ❗
alloc_benchmarks File Size	0.86 MB	0.87 MB	0.98 ❗
Allocations - Allocation success	91.35 %	91.31 %	1.00 ❗
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.55 %	61.44 %	1.00 ❗
Allocations - Average Allocation time	18166.61 Ticks (±1273.55 Ticks)	5860.58 Ticks (±98.43 Ticks)	3.10 ❗
Allocations - Average Allocation time (no fail)	19230.89 Ticks (±1586.40 Ticks)	6554.81 Ticks (±92.86 Ticks)	2.93 ❗
Allocations - Average Deallocation time	4475.91 Ticks (±1239.90 Ticks)	1805.01 Ticks (±250.35 Ticks)	2.48 ❗
mutex_benchmark Build Time	209.51 s	79.82 s	2.62 ❗
mutex_benchmark File Size	0.89 MB	0.86 MB	1.03 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	35.82 ns (±7.59 ns)	12.10 ns (±0.41 ns)	2.96 ❗
Mutex Stress Test Average Time per Iteration - 2 Threads	32.52 ns (±8.43 ns)	40.26 ns (±1.68 ns)	0.81

This comment was automatically generated by workflow using github-action-benchmark.