Doing maps:find creates the ok-tuple, which means garbage, and also then
needs to match on it. It it more efficient to pattern-match on the map key.

Perf/metrics

Pattern match the map key for more efficiency

It will be handled by mongoose_config_handler.

The goal is better separation between specs and utils

API:
- config_spec/0 returns the config section spec for all possible HTTP handlers
- get_routes/1 returns Cowboy routes for a list of configured handlers

There are two optional callbacks:
- config_spec/0 returning config specification for the handler,
  if it has any options
- routes/1 returning Cowboy routes, if different from the default

All handlers which have options should be listed
  in configurable_handler_modules/0

Use maps with defaults in the config spec

Use maps with defaults, include all handlers by default

- Use maps with defaults for options

Expect options in a map

- Use maps with defaults
- Include all handlers by default

New options:
- 'handlers' - to choose specific low-level handlers,
- 'docs' - to disable docs.

It will be placed in mongoose_http_handler

Also: refactor 'store_trails'

- Use maps with defaults
- Add new options
- Rework test layout after reworking mongoose_client_api config
- Remove the custom logic for comparing handler tuples

- Simplify examples to match the defaults in mongooseim.toml
- Document the new options: `handlers` and `docs`
- Update the list of available handlers

By now we have a pretty printer in the logger, and creating accumulators
is a hot operation, so we can skip this field when it is not needed.

Skip pretty-printing of unused accumulator field

Fix mod_ping with host_types

Rework HTTP handler configuration

This PR addresses "There is no easy way to reset cache without making new changes into the code. And sometimes cache breaks, because a committer did something wrong".

Proposed changes include:

    Use CI_CERT_KEY_VERSION env variable to change the key externally.
    Avoid caching invalid certificate data. It should make fixing bugs with certificates a bit easier.

MAM shaper touches

Upgrade mongoose jid

Add transaction async requests

…handlers-config-rerwork

…er configuraration