create smithy plugin to generate BDD ruleset

[sbiscigl]

Issue #, if available:

#2880

Description of changes:

Adds a flag --use-smithy-bdd-endpoints that will enable a smithy plugin to generate a BDD rules set representation and swap clients to use a BDD endpoint provider by default. from preliminary testing we see a large reduction in client contruction time and endpoints resolution time in the S3 Client

Benchmark	JSON	BDD	Δ	Speedup
s3 client construction	750,135 ns	30,639 ns	−95.9%	24.5×
steady state resolve on virtual addressing	6,006 ns	3,312 ns	−44.9%	1.81×

This PR will NOT trigger generation, a follow up PR will swap the default value, and move clients to the new endpoint provider.

Check all that applies:

• Did a review by yourself.
• Added proper tests to cover this PR. (If tests are not applicable, explain.)
• Checked if this PR is a breaking (APIs have been changed) change.
• Checked if this PR will not introduce cross-platform inconsistent behavior.
• Checked if this PR would require a ReadMe/Wiki update.

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