fix(wasm): fixed time.Sleep and Sign issues on wasm

[cnlangzi]

A brief description of the changes in this PR:

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• gosdk: fix(wasm): time.Sleep and Sign issues gosdk#413
• zboxcli: fix(wasm): fixed time.Sleep and Sign issues on wasm #190
• js-client-sdk : https://github.com/0chain/js-client-sdk/pull/103

[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	master
gosdk	fix/time_sleep_wasm
zboxcli	fix/time_sleep_wasm
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[peterlimg]

lgtm

[service-0chain]

Manual system tests [success] with the following config

config	value
tests skipped	FALSE
system-tests	master
gosdk	fix/time_sleep_wasm
zboxcli	fix/time_sleep_wasm
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging