[Hashicorp Vault] Add metric_type mapping to metrics datastream

[agithomas]

• Enhancement

Proposed commit message

• WHAT: Added metric_type mapping to metrics datastream.
• WHY : To benefit from the TSDB enablement of the package.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

How to test this PR locally

• elastic-package build
• elastic-package stack up -v -d --services package-registry
• Dashboard verification after adding dimensions field mapping (not part of this change)

Related issues

• [Hashcorp Vault] TSDB Enablement #8128

Screenshots

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• Start Time: 2023-10-11T10:07:14.667+0000

• Duration: 19 min 35 sec

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Test	Results
Failed	0
Passed	18
Skipped	0
Total	18

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (3/3)	💚
Classes	100.0% (3/3)	💚
Methods	92.593% (25/27)	👎 -3.561
Lines	87.678% (185/211)	👎 -6.475
Conditionals	100.0% (0/0)	💚

[P1llus]

Added some comments, could you please change or comment on them before any merge? :)

[agithomas]

@P1llus , can you confirm if bumping up the version to 8.9.0 is fine?

[ritalwar]

LGTM!

[P1llus]

@agithomas thats fine, as long as the PR requires it then its not a problem to bump it.

[agithomas]

/test

[elasticmachine]

Package hashicorp_vault - 1.18.0 containing this change is available at https://epr.elastic.co/search?package=hashicorp_vault