Simplify SDK tutorial by moving cmake commands to a script

[pytorchbot]

Address this comment. Tested the commands on mac locally and they worked. The script just generates etdump when working properly. I did "ls -l etdump.etdp" to check the timestamp.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3492

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As of commit dd721f5929a02fcca19e44ba437531d924eff2fc with merge base d3326a2073dee7baf78044fb3afd0772edbc616a (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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