Rename "workerd"

[letanloc1998]

I believe we should consider renaming workerd.

Currently, searching for workerd is quite challenging because search engines often treat it as a typo and automatically correct it to workers. As a result, only a small number of people are aware of workerd.

Since the suffix -d stands for daemon, perhaps a name like worker-daemon would be more intuitive and easier to find.

[jasnell]

We will not be renaming workerd at this time. If we were to do so in the future it would need to be a Cloudflare product team decision.