Port fixed point library to modern QDK

[sezna]

This PR ports the classic QDK FixedPoint library to the modern QDK. There is still some work to be done (a README, some tests), but this is a good MVP for the library to go in 1.8.

[github-actions]

Benchmark for c440ce1

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Test	Base	PR	%
Array append evaluation	338.8±4.96µs	337.8±1.62µs	-0.30%
Array literal evaluation	170.5±4.29µs	168.4±1.37µs	-1.23%
Array update evaluation	417.6±11.69µs	416.3±5.59µs	-0.31%
Core + Standard library compilation	22.7±1.14ms	24.3±0.69ms	+7.05%
Deutsch-Jozsa evaluation	5.0±0.17ms	5.0±0.26ms	0.00%
Large file parity evaluation	34.4±0.44ms	34.4±0.51ms	0.00%
Large input file compilation	13.9±0.48ms	15.0±0.65ms	+7.91%
Large input file compilation (interpreter)	50.6±0.84ms	54.4±1.76ms	+7.51%
Large nested iteration	32.8±1.04ms	33.0±0.22ms	+0.61%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1560.8±30.08µs	1586.0±74.82µs	+1.61%
Perform Runtime Capabilities Analysis (RCA) on large file sample	8.0±0.36ms	8.1±0.14ms	+1.25%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1426.9±28.90µs	1454.7±111.61µs	+1.95%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	27.7±0.23ms	28.3±1.18ms	+2.17%
Teleport evaluation	93.2±3.59µs	94.5±6.24µs	+1.39%

[swernli]

Looks good with two minor nitpicks.