Omit build | simulate | submit from aptos namespace

[0xmaayan]

Description

Fix #243

build | simulate | submit properties are available on aptos namespace but they are not functional - that causes confusion for devs that could see those properties on autocomplete under the aptos namespace but then their program breaks. Those properties should only be visible under the aptos.transaction namespace

Test Plan

pnpm test

and

const aptos = new Aptos();
aptos. // autocomplete should not show build | simulate | submit
aptos.transaction // autocomplete should show build | simulate | submit

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