caddyconfig: register adapters as Caddy modules (#3132)

* admin: Refactor /load endpoint out of caddy package

This eliminates the caddy package's dependency on the caddyconfig
package, which helps prevent import cycles.

* v2: adapter: register config adapters as Caddy modules

* v2: adapter: simplify adapter registration as adapters and modules

* v2: adapter: let RegisterAdapter be in charge of registering adapters as modules

* v2: adapter: remove underscrores placeholders

* v2: adapter: explicitly ignore the error of writing response of writing warnings back to client

* Implicitly wrap config adapters as modules

Co-authored-by: Matthew Holt <mholt@users.noreply.github.com>

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