Container stop timeouts should be in milliseconds

[digital88]

#960

• Added class Ms which provides conversion from ms to nanos and seconds.
• Explicitly call this class' conversion methods when calling Docker APIs. Example:

...
log.debug(`Stopping container...`, { containerId: container.id });
const t = new Ms(opts?.timeout ?? 0).seconds();
await container.stop({ t });
...

• Renamed parameters in all public APIs to tell that value in ms expected to be passed.
• Renamed some internal fields and methods to tell that value in ms expected there.
• Added docs for timeouts.
• Updated old docs where timeouts are used.

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[cristianrgreco]

Note to self: these are the reasons why this is a breaking change