Fix inconsistency in memory variable naming

[CGodiksen]

This PR closes #414 by fixing the inconsistent naming of the memory variable that was either multivariate or ingested. We now use ingested everywhere. We still use multivariate when talking about the shape of the data but when talking about memory we now use ingested.

The PR also adds crate descriptions to the dev docs for the two crates that were added earlier without a crate description.

[Copilot]

Pull request overview

This PR resolves the naming inconsistency for the “reserved memory for ingested data” configuration by standardizing on ingested_* across the server CLI/configuration, Flight protocol, and user-facing docs. It also updates dev documentation to include crate descriptions for previously undocumented crates.

Changes:

• Renamed the reserved-memory setting from multivariate_* to ingested_* across configuration handling, Flight protocol, and server update paths.
• Updated integration/unit tests and user documentation to reflect the new setting/flag/environment variable names.
• Added crate descriptions to the developer documentation (and a small formatting-only change in modelardb_auth).

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/user/README.md	Updates documented CLI flag and env var name for the ingested reserved memory setting.
docs/dev/README.md	Adds missing crate descriptions for modelardb_auth and modelardb_macros.
crates/modelardb_types/src/flight/protocol.proto	Renames the configuration field and update-setting enum entry to ingested_*.
crates/modelardb_server/tests/integration_test.rs	Updates integration tests to use the new proto-generated field/enum names.
crates/modelardb_server/src/storage/types.rs	Renames test functions to match the new “ingested” terminology.
crates/modelardb_server/src/storage/mod.rs	Wires ingested_reserved_memory_in_bytes() into MemoryPool construction and renames the adjust method.
crates/modelardb_server/src/remote/mod.rs	Updates the server-side UpdateConfiguration handling to the new setting name.
crates/modelardb_server/src/main.rs	Renames the CLI arg/env var binding to ingested_reserved_memory_in_bytes.
crates/modelardb_server/src/configuration.rs	Renames the persisted configuration field and its getters/setters to ingested_*.
crates/modelardb_auth/src/lib.rs	Formatting-only change to error mapping closure.

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