[Change Proposal][Bug] Allow `boolean` as a TSDB dimension

[AndersonQ]

The current spec/validation rules for TSDB fields that are allowed to be dimensions are missing boolean. Currently it's a valid type to be a dimension, see docs. However when building a package setting boolean as TSDB dimensions an validation error is shown:

Error: package installation failed: failed to build package: invalid content found in built zip package: found 8 validation errors:
   1. file "/home/user/devel/github.com/elastic/integrations/build/packages/linux-1.1.0.zip/data_stream/conntrack/fields/agent.yml" is invalid: field "host.containerized" of type boolean can't be a dimension, allowed types for dimensions: constant_keyword, keyword, long, integer, short, byte, double, float, half_float, scaled_float, unsigned_long, ip

It'd be good to update the spec and elastic-package to support boolean as it's now supported by Elasticsearch.

The list of supported types for dimension fields is validated in

package-spec/code/go/internal/validator/semantic/validate_dimensions.go

Line 36 in 3e48996

var allowedDimensionTypes = []string{

The first version of Elasticsearch that documents boolean as supported type for dimension is 8.16 (here), so it should be supported only on versions of the spec over 3.1, see https://github.com/elastic/elastic-package/blob/main/docs/howto/format_version.md#what-format-version-to-choose-for-a-package