fix: disallow sharing of memo table in IDLBuilder

[chenyan-dfinity]

We use a global memo table to map Rust type to Candid type. The same Rust type can map to a different but equivalent Candid type in different runs, due to memo match happen in different time/order. Unless we implement equivalence checking for candid types, we failed to identify these equivalent types in the type table.

The fix is easy: disallow sharing of memo tables across different encoding calls.

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Benchmark for b96661e

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Test	PR Benchmark	Master Benchmark	%
Blob/&str	230.3±75.77µs	235.8±79.60µs	-2.33%
Blob/ByteBuf	201.4±47.69µs	203.1±44.73µs	-0.84%
Blob/Bytes	118.2±33.95µs	120.9±33.99µs	-2.23%
Blob/String	313.8±88.98µs	312.0±86.14µs	+0.58%
profiles/200	495.2±23.54µs	488.2±27.16µs	+1.43%

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Benchmark for f18cc75

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Test	PR Benchmark	Master Benchmark	%
Blob/&str	254.6±78.96µs	260.2±85.41µs	-2.15%
Blob/ByteBuf	241.9±52.13µs	244.9±57.83µs	-1.22%
Blob/Bytes	144.8±40.24µs	152.7±46.30µs	-5.17%
Blob/String	340.6±85.82µs	351.8±86.98µs	-3.18%
profiles/200	576.6±33.89µs	517.9±45.50µs	+11.33%