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J. Nick Koston
5d624c7f76
The top-level `import esphome.core.config` in `esphome/loader.py` (used
only to register the "esphome" pseudo-component in `_COMPONENT_CACHE`)
was pulling `esphome.automation` + `esphome.config_validation` eagerly
into every `esphome` CLI invocation, even fast paths like
`esphome version`. Move the cache registration into `_lookup_module`,
triggered on first `get_component("esphome")`.
Also defers the two `esphome.core.config` call sites inside
`esphome/config.py` (CoreFinalValidateStep and validate_config), which
were the other eager entry point.
Local `import esphome.__main__` drops from ~49ms to ~46ms; more
importantly, `esphome.core.config` / `esphome.automation` no longer
appear in the top offenders table, and `esphome.config_validation`
drops from 4.7ms self to 2.0ms self on CI.
