docs(examples): use ratatui::crossterm in examples

[joshka]

We import from `ratatui::crossterm`` instead of crossterm directly in
the examples to ensure that the version of the crossterm crate used is
the same one as the one used by ratatui. This helps avoid compilation
errors resulting from multiple versions of the same crate.

Also avoids importing from the prelude in the examples.

[github-actions]

Bencher

Report	Sat, August 10, 2024 at 03:46:05 UTC
Project	Ratatui
Branch	1315/merge
Testbed	ubuntu-latest

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Benchmark	Latency	Latency Results nanoseconds (ns)
barchart/render/2048	➖ (view plot)	202,360.00
barchart/render/256	➖ (view plot)	134,290.00
barchart/render/64	➖ (view plot)	88,005.00
barchart/render_grouped/2048	➖ (view plot)	348,980.00
barchart/render_grouped/256	➖ (view plot)	145,000.00
barchart/render_grouped/64	➖ (view plot)	133,770.00
barchart/render_horizontal/2048	➖ (view plot)	162,560.00
barchart/render_horizontal/256	➖ (view plot)	80,925.00
barchart/render_horizontal/64	➖ (view plot)	74,073.00
block/render_all_feature/100x50	➖ (view plot)	10,151.00
block/render_all_feature/200x50	➖ (view plot)	18,093.00
block/render_all_feature/256x256	➖ (view plot)	84,960.00
block/render_empty/100x50	➖ (view plot)	5,646.40
block/render_empty/200x50	➖ (view plot)	11,108.00
block/render_empty/256x256	➖ (view plot)	71,272.00
buffer/empty/16	➖ (view plot)	831.25
buffer/empty/255	➖ (view plot)	227,730.00
buffer/empty/64	➖ (view plot)	13,993.00
buffer/filled/16	➖ (view plot)	814.28
buffer/filled/255	➖ (view plot)	223,860.00
buffer/filled/64	➖ (view plot)	13,685.00
buffer/with_lines/16	➖ (view plot)	8,994.30
buffer/with_lines/255	➖ (view plot)	8,816.10
buffer/with_lines/64	➖ (view plot)	8,857.40
line_render/Center/0	➖ (view plot)	3.71
line_render/Center/10	➖ (view plot)	428.03
line_render/Center/3	➖ (view plot)	226.95
line_render/Center/4	➖ (view plot)	250.76
line_render/Center/42	➖ (view plot)	542.37
line_render/Center/6	➖ (view plot)	268.27
line_render/Center/7	➖ (view plot)	301.82
line_render/Left/0	➖ (view plot)	3.71
line_render/Left/10	➖ (view plot)	383.07
line_render/Left/3	➖ (view plot)	154.67
line_render/Left/4	➖ (view plot)	165.86
line_render/Left/42	➖ (view plot)	543.48
line_render/Left/6	➖ (view plot)	255.10
line_render/Left/7	➖ (view plot)	265.95
line_render/Right/0	➖ (view plot)	3.72
line_render/Right/10	➖ (view plot)	386.92
line_render/Right/3	➖ (view plot)	225.80
line_render/Right/4	➖ (view plot)	265.11
line_render/Right/42	➖ (view plot)	541.99
line_render/Right/6	➖ (view plot)	342.28
line_render/Right/7	➖ (view plot)	383.49
list/render/16384	➖ (view plot)	1,144,800.00
list/render/2048	➖ (view plot)	261,250.00
list/render/64	➖ (view plot)	141,380.00
list/render_scroll_half/16384	➖ (view plot)	1,142,400.00
list/render_scroll_half/2048	➖ (view plot)	267,470.00
list/render_scroll_half/64	➖ (view plot)	95,980.00
paragraph/new/2048	➖ (view plot)	248,850.00
paragraph/new/64	➖ (view plot)	6,659.30
paragraph/new/65535	➖ (view plot)	7,976,900.00
paragraph/render/2048	➖ (view plot)	439,850.00
paragraph/render/64	➖ (view plot)	400,480.00
paragraph/render/65535	➖ (view plot)	1,630,800.00
paragraph/render_scroll_full/2048	➖ (view plot)	392,520.00
paragraph/render_scroll_full/64	➖ (view plot)	428,000.00
paragraph/render_scroll_full/65535	➖ (view plot)	1,569,300.00
paragraph/render_scroll_half/2048	➖ (view plot)	389,670.00
paragraph/render_scroll_half/64	➖ (view plot)	433,910.00
paragraph/render_scroll_half/65535	➖ (view plot)	1,572,100.00
paragraph/render_wrap/2048	➖ (view plot)	215,580.00
paragraph/render_wrap/64	➖ (view plot)	181,430.00
paragraph/render_wrap/65535	➖ (view plot)	1,397,300.00
paragraph/render_wrap_scroll_full/2048	➖ (view plot)	214,540.00
paragraph/render_wrap_scroll_full/64	➖ (view plot)	181,750.00
paragraph/render_wrap_scroll_full/65535	➖ (view plot)	1,382,000.00
rect_rows/rows/1024	➖ (view plot)	322.51
rect_rows/rows/16	➖ (view plot)	5.25
rect_rows/rows/65535	➖ (view plot)	20,282.00
sparkline/render/2048	➖ (view plot)	126,980.00
sparkline/render/256	➖ (view plot)	119,540.00
sparkline/render/64	➖ (view plot)	38,124.00

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