[Logs Explorer] Update DataGrid default preferences

[tonyghiani]

📓 Summary

Closes #165482
Closes #165489

This PR apply new default preferences to the DataGrid for the Log Explorer:

• Display and resize additional columns for service.name (240px) and host.name (320px) fields. The column's width is taken by the average length of those specific fields.
• Display rows with single-line height by default.

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)

[apmmachine]

🤖 GitHub comments

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[davismcphee]

Code-only review, ROWS_HEIGHT_OPTIONS changes LGTM 👍

[weltenwort]

I like the approach to define a few standard column sizes. 👍 But I wonder if it's really justified to use two different defaults for service.name and host.name. Intuitively their different widths looked "wrong" to me. 🤷 Can we really make any assumptions about their usual length?

[tonyghiani]

[Discover] Set data table row height to auto-fit by default #164218

I agree it looks kind of weird to have different sizes, but reserving a bigger space for both columns also seemed to leave less space for the message column.
I'll merge this to unblock #164218, but let's talk with @formgeist @isaclfreire to refine these sizes.

[formgeist]

@tonyghiani Doesn't the data grid provide decent auto sizing of the columns which we can utilize? Do we need to reserve a fixed width for the values?

[tonyghiani]

@tonyghiani Doesn't the data grid provide decent auto sizing of the columns which we can utilize? Do we need to reserve a fixed width for the values?

When adding new columns, if no configuration is provided for the specific Discover DataGrid component, the space is divided evenly for all the added columns.
Currently, I provided a configuration only for these new fields, so that the message column can get the rest of it.

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: e19489d

Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
logExplorer	336	429	+93

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/unified-data-table	39	42	+3

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
discover	556.4KB	556.5KB	+105.0B
logExplorer	220.9KB	221.1KB	+262.0B
total			+367.0B

Unknown metric groups

API count

id	before	after	diff
@kbn/unified-data-table	88	92	+4

History

• 💚 Build #157540 succeeded db121a4
• 💔 Build #157510 failed b6a70bb
• 💔 Build #156813 failed 79474cd
• 💔 Build #156710 failed 8c2f743
• 💔 Build #156674 failed e6cc2b8
• 💔 Build #156541 failed 192d4b2

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