Initialize JLine terminal asynchronously

[Akirathan]

#8496 switched from DumbTerminal to a proper JLine terminal. This adds 80 ms to the startup time.

fast.nps is a profiling snapshot from #8553 (comment) (from older revision before #8496) and t.nps is after #8596.

We can see that there is roughly 80 ms difference in makeTerminalForRepl. Moreover, we can see that in fast.nps, only DumbTerminal is initialized.

Both profiling snapshots are attached in profilings.zip

Let's initialize the JLine terminal asynchronously.

[Akirathan]

Duplicated by #8690

[enso-bot]

Jaroslav Tulach reports a new STANDUP for yesterday (2024-09-23):

Progress: .

• catching up - parser in multiple threads: Stateless parser API #11147 (review)
• addressing review comments: Allow control of throwDeniedThreadAccess via TruffleContext.threadAccessDeniedHandler oracle/graal#8266 (comment)
• PR for helidon integrated!: Grouping Executors related methods into a single class helidon-io/helidon#9271
• verified the helidon fix still works for Enso: Ydoc native image #10783 (comment)
• Initialize JLine terminal asynchronously #8688 Delay JLine init: Initialize Enso Terminal in a background thread #11149
• Name.Blank causes "Unexpected internal error" after adding a return type #11090 fix by Eliminate Blanks inside of Type.Ascription #11155
• discussing DuckDB, stream processing, etc: https://discord.com/channels/@me/960509000154247198/1287770796072243252
• Comparing In-Memory and SQLite
• standups & demo meetings
• meeting Dmitry (ydoc substitutions, environment)
• Discussing licensing with Rainer Eschrich It should be finished by 2024-09-24.

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