codenotary / immudb / 25054545323

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fix(store): warn when MaxValueLen/MaxKeyLen/MaxTxEntries/FileSize options are silently ignored

These four options are persisted to store metadata at creation time and cannot
be changed on subsequent opens. Previously, supplying a different value via
WithMaxValueLen/etc. on a re-open was silently ignored, which surprised users
expecting their option to take effect (e.g., raising MaxValueLen from 4Kb to
10Mb on an existing store).

- Emit a Warningf in OpenWith when the supplied option differs from the value
  read from store metadata, naming both values and the resolution.
- Document the creation-time-only semantics in the doc comments of
  WithMaxValueLen, WithMaxKeyLen, WithMaxTxEntries, and WithFileSize.

No semantic change to store behavior; the stored value continues to win.

Closes #1864

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