Panw | Support text values on panos.certificate.size field

[kcreddy]

What does this PR do?

Current Scenario:
The field panw.panos.certificate.size is not always a long type. Populating error.message when the field failed to convert to long is causing confusion to users.

Change:

• Remove the conversion of panw.panos.certificate.size to long and change it to keyword type to support string fields as well.
• Convert only the ECS field tls.client.x509.public_key_size to long and on_failure remove the field, but not populate error.message which is misleading.
• Keep the original field panw.panos.certificate.size for user reference

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.

Related issues

• Closes Panw | Error converting certificate.size field into long #4663

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• Start Time: 2022-11-16T11:00:51.531+0000

• Duration: 19 min 36 sec

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Passed	51
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Total	51

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Name	Metrics % (covered/total)	Diff
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Classes	100.0% (15/15)	💚 2.53
Methods	98.529% (67/68)	👍 7.631
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