feat(cli): add local_smtp config

[7ttp]

TL;DR

adds local_smtp as the new preferred config key, keeps inbucket valid with a deprecation warning and updates the default template to use local_smtp

what's introduced:

local_smtp is now the preferred config/schema key, while existing
inbucket configs continue to work for now....

why

basically this moves the config away from an implementation specific name without breaking existing setups in phase 1 :)

ref

• closes Update old references to Inbucket with Mailpit #5222

[coveralls]

Coverage Report for CI Build 26250005449

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Coverage: 63.767%

Details

• Patch coverage: No coverable lines changed in this PR.

Uncovered Changes

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Coverage Regressions

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Coverage Stats

Relevant Lines:	15701
Covered Lines:	10012
Line Coverage:	63.77%
Coverage Strength:	7.07 hits per line

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