Remove name from opspecs

[apexskier]

💥 Proposal

The top level name property in an op.yml file isn't currently used for anything at runtime and causes confusion when compared to an op ref. It's also generally extra boilerplate the people (including me) forget to update, as most of the time it matches the name of the containing directory if the op is defined in an .opspec directory.

The use case of documentation for a human is provided by the description field.

I think the op ref is more useful in most cases, since it's what someone must know in order to use an op.

Removing the name field is easy (7e86c43) and can be backwards compatible by marking it optional and deprecated in the json schema.

Related: #634 (comment)

[apexskier]

The opspec version field is also essentially useless and could be removed.