refactor: rename info() to header() (#6138)

This change renames all the `info()` functions to `header()`, since they return `LedgerHeader` structs. It also renames the underlying variables from `info_` to `header_`.

include/xrpl/ledger/CachedView.h

@@ -48,9 +48,9 @@ public:
     }
 
     LedgerHeader const&
-    info() const override
+    header() const override
     {
-        return base_.info();
+        return base_.header();
     }
 
     Fees const&

include/xrpl/ledger/OpenView.h

@@ -82,7 +82,7 @@ private:
         monotonic_resource_;
     txs_map txs_;
     Rules rules_;
-    LedgerHeader info_;
+    LedgerHeader header_;
     ReadView const* base_;
     detail::RawStateTable items_;
     std::shared_ptr<void const> hold_;
@@ -189,7 +189,7 @@ public:
     // ReadView
 
     LedgerHeader const&
-    info() const override;
+    header() const override;
 
     Fees const&
     fees() const override;

include/xrpl/ledger/ReadView.h

@@ -81,7 +81,7 @@ public:
 
     /** Returns information about the ledger. */
     virtual LedgerHeader const&
-    info() const = 0;
+    header() const = 0;
 
     /** Returns true if this reflects an open ledger. */
     virtual bool
@@ -91,14 +91,14 @@ public:
     NetClock::time_point
     parentCloseTime() const
     {
-        return info().parentCloseTime;
+        return header().parentCloseTime;
     }
 
     /** Returns the sequence number of the base ledger. */
     LedgerIndex
     seq() const
     {
-        return info().seq;
+        return header().seq;
     }
 
     /** Returns the fees for the base ledger. */

include/xrpl/ledger/detail/ApplyViewBase.h

@@ -28,7 +28,7 @@ public:
     open() const override;
 
     LedgerHeader const&
-    info() const override;
+    header() const override;
 
     Fees const&
     fees() const override;