fix: Changes the type of Size() to uint64

[EclesioMeloJunior]

Description

• Wazero issue: api.Memory.Size() overflows when the memory has the maximum 65536 pages tetratelabs/wazero#1852

Cherry-picked commits:

• tetratelabs@8a61b01
• tetratelabs@1458ccc

[CLAassistant]

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2 out of 4 committers have signed the CLA.

✅ EclesioMeloJunior
✅ timwu20
❌ mathetake
❌ ncruces
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