micsosoft_sqlserver: allow text encoding configuration

[efd6]

What does this PR do?

This adds an advanced configuration option to allow users to specify the text encoding to be used.

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

• Closes MSSQL Integration (for Audit Logs) #4538

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• Start Time: 2022-11-04T09:57:45.982+0000

• Duration: 17 min 20 sec

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Test	Results
Failed	0
Passed	19
Skipped	0
Total	19

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚 2.504
Classes	100.0% (2/2)	💚 2.504
Methods	93.333% (28/30)	👍 2.492
Lines	100.0% (1238/1238)	💚 8.052
Conditionals	100.0% (0/0)	💚

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

[kcreddy]

LGTM

[muthu-mps]

@efd6 - Are we also adding b) Support the ability to ignore files older than a certain time frame ? or only the text encoding configuration ?

[efd6]

@muthu-mps This is just adding the text encoding configuration option.