Add changelogs

Author: jasagredo

ouroboros-consensus-cardano/changelog.d/20250729_124022_javier.sagredo_lsm1.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+### Breaking
+
+- Implement block instances needed for supporting LSM-trees LedgerDB V2 backend.

ouroboros-consensus-diffusion/changelog.d/20250729_125052_javier.sagredo_lsm1.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+### Breaking
+
+- `srnLdbFlavorArgs` was renamed to `srnLedgerDbBackendArgs` and changed its type to `LedgerDBBackendArgs`.
+

ouroboros-consensus/changelog.d/20250729_124008_javier.sagredo_lsm1.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+### Breaking
+
+- Implement LSM-trees backend for LedgerDB V2 handles.
+- Group snapshot management functions in the new datatype `SnapshotManager`.
+- `forkerRangeRead` now returns also the maximal key found in the backend.
+- Deleted `LedgerSupportsOnDiskLedgerDB` constraint and created `LedgerSupports(V1|V2|LSM|LMDB)LedgerDB`.
+- Define new type family `LSMTxOut` and `HasLSMTxOut` class.
+- Define new `LedgerDbBackendArgs` that will be provided by the node.