feat(imperativeHandles): implemented noVNC RFB methods

[roerohan]

Description

Implemented the following imperativeHandles from RFB.

sendCredentials,
sendKey,
sendCtrlAltDel,
focus,
blur,
machineShutdown,
machineReboot,
machineReset,
clipboardPaste

Resolved issues

Closes #27

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[github-actions[bot]]

:tada: This PR is included in version 0.5.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: