Rename fixed shape tensor module and id

[connortsui20]

Summary

Just renames the module and also the ID to "vortex.tensor.fixed_shape_tensor".

Testing

N/A

[codspeed-hq]

Merging this PR will degrade performance by 35.21%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 4 improved benchmarks
❌ 6 regressed benchmarks
✅ 1188 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	runend[10M_i32_runlen_10]	195.1 µs	163 µs	+19.69%
⚡	WallTime	runend[10M_i32_runlen_1000]	135.2 µs	103.4 µs	+30.69%
⚡	WallTime	dynamic_dispatch_u32[10M]	169 µs	117.8 µs	+43.48%
❌	WallTime	dynamic_dispatch_u32[10M]	107.5 µs	158.8 µs	-32.3%
❌	WallTime	dynamic_dispatch_u32[10M]	109.6 µs	159.7 µs	-31.41%
⚡	WallTime	dynamic_dispatch_u32[10M]	161.8 µs	111.6 µs	+44.95%
❌	WallTime	dynamic_dispatch_u32[10M]	94.2 µs	145.4 µs	-35.21%
❌	WallTime	10M_50%[5000000]	276.8 µs	309 µs	-10.41%
❌	WallTime	10M_10%[1000000]	214.8 µs	239 µs	-10.15%
❌	Simulation	bitwise_not_vortex_buffer_mut[128]	246.1 ns	275.3 ns	-10.6%

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_{Comparing ct/fix-tensor-name (e81a405) with develop (c73dbb2)}