Add traits feature for dogma dependency in protoflow-core

[SamuelSarle]

protoflow-core depends on dogma version 0.1 which by default pulls the latest 0.1.8.
protoflow-core then uses the traits module here:
https://github.com/asimov-platform/protoflow/blob/0cda080fc559c14361cd83c6ffb4b1b99ef06150/lib/protoflow-core/src/prelude.rs#L62

But dogma has feature-gated that behind traits since around 0.1.3:
dogmatists/dogma.rs@eeb838c

The error:

error[E0432]: unresolved import `dogma::traits`
  --> lib/protoflow-core/src/prelude.rs:62:16
   |
62 | pub use dogma::traits::{Labeled, MaybeLabeled, MaybeNamed, Named};
   |                ^^^^^^ could not find `traits` in `dogma`
   |
note: found an item that was configured out
  --> ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/dogma-0.1.8/src/lib.rs:36:9
   |
36 | pub mod traits;
   |         ^^^^^^
note: the item is gated here
  --> ~/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/dogma-0.1.8/src/lib.rs:27:1
   |
27 | / #[cfg(any(
28 | |     feature = "traits",
29 | |     any(
30 | |         feature = "collection",
...  |
35 | | ))]
   | |___^

Outcomes:

1. A clean checkout of this repo fails (you can also see this by doing rm Cargo.lock && cargo check, your lockfile—like mine—probably has a version with which everything here seems to be fine)
2. Crates that depend on protoflow-core are also broken if they neither pin dogma = "=0.1.2" in their Cargo.toml nor have a lockfile with <0.1.3

[SamuelSarle]

@race-of-sloths invite

[github-actions]

⚠️ CI failed

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[race-of-sloths]

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Current status: executed

Reviewer	Score
@artob	3

Your contribution is much appreciated with a final score of 3!
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[artob]

@race-of-sloths score 3