feat: add polygon symbol #501

Job	Run time
wasm	14s
miri --no-default-features	43s
feature-checks	52s
miri	41s
test stable --no-default-features	16s
clippy	15s
miri --all-features	1m 8s
test stable	12s
test stable --all-features	22s
docs	14s
test beta --no-default-features	24s
fmt	12s
test beta	14s
test beta --all-features	27s
test nightly --no-default-features	18s
test nightly	24s
test nightly --all-features	31s
test 1.81 --no-default-features	17s
test 1.81	18s
deny / cargo deny check	14s
	8m 16s

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