ti_recordedfuture: scrape provider details from evidence fields

[efd6]

What does this PR do?

This extracts provider names from the evidence details fields in order to populate threat.indicator.provider.

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Fixes [ti_recordedfuture] Missing threat.indicator.provider #5960

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• Start Time: 2023-04-24T01:34:08.431+0000

• Duration: 16 min 30 sec

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Test	Results
Failed	0
Passed	11
Skipped	0
Total	11

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	100.0% (17/17)	💚
Lines	97.585% (202/207)	👍 2.302
Conditionals	100.0% (0/0)	💚

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[kcreddy]

LGTM 👍🏼

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Package ti_recordedfuture - 1.7.0 containing this change is available at https://epr.elastic.co/search?package=ti_recordedfuture