Validate the proper value of event.dataset

[jsoriano]

If the event.dataset and data_stream.dataset fields are used, they must have as values the name of the package and the name of the data stream, separated by a dot.

Fixes elastic/package-spec#217.
Part of elastic/package-spec#399.

[jsoriano]

This is not possible now. We don't allow to override the type of an imported value. But I think it would make sense to support the change from keyword to constant_keyword. I will open a PR to support it.

[jsoriano]

Added in #969.

[elasticmachine]

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• Start Time: 2022-09-08T16:03:36.193+0000

• Duration: 27 min 48 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (34/34)	💚
Files	66.929% (85/127)	👍
Classes	61.667% (111/180)	👍
Methods	48.834% (356/729)	👍 0.141
Lines	32.204% (3221/10002)	👍 0.129
Conditionals	100.0% (0/0)	💚

[mrodm]

LGTM