Add ByteSize impl for CString

[wcampbell0x2a]

• Use the new dynamic bytes attribute to apply to CString, which in many protocols you already have the size of the CString, so might as well use it

[github-actions[bot]]

Benchmark for e130d8d

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| Test | Base | PR | % | |------|--------------|------------------|---| | count_from_u8_specialize | **98.7±0.63ns** | 100.1±5.48ns | **+1.42%** | | count_no_specialize | **2.4±0.02µs** | 2.6±0.02µs | **+8.33%** | | count_specialize | **100.0±0.67ns** | 100.9±1.74ns | **+0.90%** | | deku_read_bits | 1175.5±21.31ns | **1127.4±13.80ns** | **-4.09%** | | deku_read_byte | 4.9±0.05ns | **4.6±0.05ns** | **-6.12%** | | deku_read_enum | 4.1±0.06ns | **3.8±0.08ns** | **-7.32%** | | deku_read_vec | **30.2±0.31ns** | 31.4±0.50ns | **+3.97%** | | deku_write_bits | **189.8±6.24ns** | 198.8±8.03ns | **+4.74%** | | deku_write_byte | 25.8±0.38ns | 25.8±0.43ns | 0.00% | | deku_write_enum | 23.9±0.39ns | 24.1±1.30ns | +0.84% | | deku_write_vec | 437.2±5.52ns | 433.4±13.06ns | -0.87% | | read_all | **4.3±0.07µs** | 5.0±0.04µs | **+16.28%** | | read_all_bytes | 4.8±0.11µs | **4.3±0.04µs** | **-10.42%** |

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Benchmark for c01eb5b

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| Test | Base | PR | % | |------|--------------|------------------|---| | count_from_u8_specialize | 115.2±1.16ns | **91.2±1.58ns** | **-20.83%** | | count_no_specialize | **2.5±0.05µs** | 2.6±0.01µs | **+4.00%** | | count_specialize | 102.5±1.26ns | **96.8±1.30ns** | **-5.56%** | | deku_read_bits | **1163.9±9.14ns** | 1174.8±23.60ns | **+0.94%** | | deku_read_byte | 4.5±0.04ns | 4.5±0.06ns | 0.00% | | deku_read_enum | 3.8±0.07ns | 3.8±0.06ns | 0.00% | | deku_read_vec | 47.1±0.89ns | **30.1±0.19ns** | **-36.09%** | | deku_write_bits | **187.4±5.62ns** | 209.7±7.88ns | **+11.90%** | | deku_write_byte | 26.1±0.43ns | 26.1±0.40ns | 0.00% | | deku_write_enum | 23.9±0.41ns | 23.9±0.40ns | 0.00% | | deku_write_vec | 449.4±7.82ns | **431.0±4.73ns** | **-4.09%** | | read_all | 5.0±0.02µs | 5.0±0.03µs | 0.00% | | read_all_bytes | 5.1±0.29µs | **4.2±0.03µs** | **-17.65%** |