Merge pull request #6421 from yyforyongyu/tlv-compress

tlv: add new record type to encode `BigSize`

docs/release-notes/release-notes-0.15.0.md

@@ -182,6 +182,9 @@ then watch it on chain. Taproot script spends are also supported through the
   package](https://github.com/lightningnetwork/lnd/pull/6354).
 
 
+* [Add a new method in `tlv` to encode an uint64/uint32 field using `BigSize`
+  format.](https://github.com/lightningnetwork/lnd/pull/6421)
+
 ## RPC Server
 
 * [Add value to the field