[WIP] Use internal, atomic configuration lookup Array

[marcotc]

What does this PR do?

Motivation:

Change log entry

Additional Notes:

How to test the change?

[dd-octo-sts]

👋 Hey @marcotc, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

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^{Visited at: 2026-06-24 22:37:54 UTC}

[dd-octo-sts]

Typing analysis

Note: Ignored files are excluded from the next sections.

Untyped methods

This PR introduces 1 untyped method, and clears 1 partially typed method.

Untyped methods (+1-0)

❌ Introduced:

sig/datadog/tracing/contrib/configuration/resolvers/pattern_resolver.rbs:7
└── def resolve: (untyped value) -> untyped

Partially typed methods (+0-1)

✅ Cleared:

sig/datadog/tracing/contrib/configuration/resolvers/pattern_resolver.rbs:7
└── def resolve: (untyped value) -> (nil | untyped)

Untyped other declarations

This PR introduces 1 partially typed other declaration. It decreases the percentage of typed other declarations from 82.62% to 82.56% (-0.06%).

Partially typed other declarations (+1-0)

❌ Introduced:

sig/datadog/tracing/contrib/configurable.rbs:8
└── @resolver: Contrib::Configuration::Resolver[untyped, untyped, untyped]?

If you believe a method or an attribute is rightfully untyped or partially typed, you can add # untyped:accept on the line before the definition to remove it from the stats.

[datadog-official]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 90.03% (+0.01%)

_{This comment will be updated automatically if new data arrives.
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