chore: add feesProvisionTracker to IProvisionTracker interface

Signed-off-by: Tomás Migone <tomas@edgeandnode.com>

Author: tmigone

packages/interfaces/contracts/toolshed/internal/IProvisionTracker.sol

@@ -4,4 +4,11 @@ pragma solidity 0.8.27;
 interface IProvisionTracker {
     // Errors
     error ProvisionTrackerInsufficientTokens(uint256 tokensAvailable, uint256 tokensRequired);
+
+    /**
+     * @notice Gets the fees provision tracker
+     * @param indexer The address of the indexer
+     * @return The fees provision tracker
+     */
+    function feesProvisionTracker(address indexer) external view returns (uint256);
 }