refine IDLValue::Blob display

[chenyan-dfinity]

Display hex escape for non-ascii blob value

[github-actions]

Benchmark for cb2ed89

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Test	Base	PR	%
Blob/&str	658.9±100.40µs	652.1±98.65µs	-1.03%
Blob/ByteBuf	374.8±92.81µs	374.6±91.55µs	-0.05%
Blob/Bytes	411.1±76.92µs	413.6±76.61µs	+0.61%
Blob/String	680.1±268.09µs	676.3±263.26µs	-0.56%
Collections/vec (text, nat)	51.8±1.51ms	51.1±4.29ms	-1.35%
Collections/vec int	23.0±0.09ms	22.7±0.19ms	-1.30%
Collections/vec int64	17.0±0.09ms	17.1±0.44ms	+0.59%
Collections/vec nat8	12.2±0.42ms	12.2±0.10ms	0.00%
option list/1024	986.2±10.25µs	975.7±7.32µs	-1.06%
profiles/1024	1907.0±73.33µs	1902.8±48.72µs	-0.22%
variant list/1024	796.8±5.49µs	802.8±8.92µs	+0.75%

[github-actions]

Benchmark for b22416e

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Test	Base	PR	%
Blob/&str	607.9±82.37µs	605.8±86.51µs	-0.35%
Blob/ByteBuf	356.4±88.60µs	358.3±92.67µs	+0.53%
Blob/Bytes	392.4±66.00µs	364.0±61.29µs	-7.24%
Blob/String	332.7±140.26µs	366.4±127.57µs	+10.13%
Collections/vec (text, nat)	51.5±3.48ms	50.8±1.18ms	-1.36%
Collections/vec int	22.6±0.09ms	23.4±0.37ms	+3.54%
Collections/vec int64	16.6±0.09ms	16.3±0.11ms	-1.81%
Collections/vec nat8	11.6±0.17ms	11.8±0.17ms	+1.72%
option list/1024	979.4±10.78µs	987.2±32.35µs	+0.80%
profiles/1024	1865.6±15.03µs	1866.1±48.68µs	+0.03%
variant list/1024	793.6±6.77µs	809.1±14.14µs	+1.95%

[github-actions]

Benchmark for efd6708

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Test	Base	PR	%
Blob/&str	627.8±100.26µs	629.2±97.43µs	+0.22%
Blob/ByteBuf	359.4±87.37µs	367.2±87.76µs	+2.17%
Blob/Bytes	400.6±76.87µs	403.9±77.33µs	+0.82%
Blob/String	658.0±257.90µs	653.1±249.25µs	-0.74%
Collections/vec (text, nat)	53.6±1.48ms	54.1±2.92ms	+0.93%
Collections/vec int	23.2±0.09ms	23.3±0.12ms	+0.43%
Collections/vec int64	16.3±0.54ms	15.6±0.08ms	-4.29%
Collections/vec nat8	12.1±0.20ms	12.1±0.16ms	0.00%
option list/1024	973.7±9.05µs	980.3±10.43µs	+0.68%
profiles/1024	1900.4±36.94µs	1855.3±40.74µs	-2.37%
variant list/1024	804.7±9.18µs	801.8±12.74µs	-0.36%