Consider inferring symbolic name from SST name in `import`

[toddjonker]

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          *Side Note*: I still dislike that if my shared module was called `g3d` that I would have to write something like:

(import g3d "g3d" 1)

Originally posted by @almann in https://github.com/amazon-ion/ion-docs/pull/208#discussion_r1178431852