Update usage of `shape` crate for 0.7.0-preview.n releases

[benjamn]

This PR cherry-picks the crucial [email protected] version update from PR #8143 as a standalone commit (note: previously known as [email protected]), before introducing any abstract types-related changes, which should make these Shape-related updates much easier to review.

This update benefits all ConnectSpec versions, while still allowing us to preserve backwards/forwards compatibility for older versions (connect/v0.3 and earlier). It would be a shame to have to maintain two slightly different shape APIs (colliding on the same cargo package name) in order to keep connect/v0.3 and earlier working as before. Fortunately, we do not need to maintain a fork like that at the level of the shape library.

One of the goals of this commit is to show how limited/reasonable the updates are, because the new functionality coming in [email protected] does not radically alter the behavior of the library (at least not in the ways we were previously using it). Notable (expected) changes: we've started using a shape.locations() method instead of accessing/mutating the shape.locations vector directly, the new shape name tracking system allows better error messages, and shape pretty-printing may now include newlines/indentation for readability.

If this PR looks good and it meets the needs of the Router connectors implementation, I hope it can lend general confidence/support to the [email protected] minor version update, even though I know most of the team has not had a chance to review the upstream changes in detail.

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