Remove lodash

[connor-baer]

Purpose

Lodash doesn't play well with ES modules and bloats Foundry's install size.

Approach and changes

• Replace most lodash helpers with simple internal implementations
• Replace lodash.merge with deepmerge-ts

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests

[changeset-bot]

⚠️ No Changeset found

Latest commit: 64fd88c

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