Add IoChannelCapTableEntry::getType().

[kentonv]

There's one place in the internal codebase that needs it.

[ask-bonk]

The change is minimal and straightforward: a 2-line addition of a const getter for the private type field on IoChannelCapTableEntry. Let me verify there are no concerns:

1. getType() is const-correct -- returns by value, marked const. Correct.
2. No backward compatibility concern -- this is purely additive (a new public method on a C++ class, no schema change).
3. No security concern -- the Type enum is already public, and getChannelNumber() already reveals the type indirectly (it throws on mismatch). This just provides a non-throwing way to query it.
4. Naming follows KJ style -- getType() is the expected getter name for a field called type.
5. No memory safety or concurrency concern -- trivial value-type return.

There are no actionable issues with this change.

LGTM

github run

[jasnell]

Ugh... no thank you Bonk.

[danlapid]

Mind as well just merge it