perf(std): add cache for gfx viewport

[doodlewind]

See the get offsetWidth row in following recording on low end device:

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[github-actions]

size-limit report 📦

Path	Size
@blocksuite/affine	13 B (0%)
@blocksuite/affine/effects	2.11 MB (+0.02% 🔺)
@blocksuite/affine/block-std	158.62 KB (+0.11% 🔺)
@blocksuite/affine/block-std/gfx	82.52 KB (+0.09% 🔺)
@blocksuite/affine/global	13 B (0%)
@blocksuite/affine/global/utils	13.88 KB (0%)
@blocksuite/affine/global/env	217 B (0%)
@blocksuite/affine/global/exceptions	562 B (0%)
@blocksuite/affine/global/di	1.65 KB (0%)
@blocksuite/affine/global/types	13 B (0%)
@blocksuite/affine/store	78.66 KB (0%)
@blocksuite/affine/inline	32.66 KB (0%)
@blocksuite/affine/inline/consts	242 B (0%)
@blocksuite/affine/inline/types	13 B (0%)
@blocksuite/affine/presets	1.9 MB (-0.03% 🔽)
@blocksuite/affine/blocks	1.99 MB (-0.03% 🔽)
@blocksuite/affine/blocks/schemas	89.95 KB (0%)