Merge branch 'main' into dl/type-expressions

Author: dlarocque

.changeset/cool-bulldogs-impress.md

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+---
+'@firebase/ai': minor
+'firebase': minor
+---
+
+Added automatic function calling capability when using `ChatSession`.

.changeset/eighty-ghosts-pull.md

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+---
+'firebase': minor
+'@firebase/firestore': minor
+---
+
+Support added for the following string Pipeline expressions: `stringRepeat`, `stringReplaceOne`, `stringReplaceAll`, `stringIndexOf`, `ltrim`, `rtrim`.

.changeset/few-dodos-ring.md

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+---
+'firebase': minor
+'@firebase/firestore': minor
+---
+
+Add support for first, last, array_agg and array_agg_distinct expressions

.changeset/long-monkeys-prove.md

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+---
+'firebase': minor
+'@firebase/firestore': minor
+---
+
+Add support for rand and trunc pipeline expressions