feat: introduce local nv21 skeleton

Introduce nv21 skeleton for local testing:

- Use local go-state-types with actor_version_checklist changes: https://github.com/filecoin-project/go-state-types/blob/master/actors_version_checklist.md
- Imports mock v12-actors bundle
- Define upgrade heights
- Generate adapters
- Add upgrade schedule and migration
- Add actorstype to the NewActorRegistry in /chain/consensus/computestate.go
- Add upgrade field to api/types.go/ForkUpgradeParams
- Add upgrade to node/impl/full/state.go
- Add network version to chain/state/statetree.go
- make jen
- make docsgen-cli

documentation/en/api-v0-methods-miner.md

@@ -475,7 +475,7 @@ Inputs:
   ],
   "Bw==",
   10101,
-  20
+  21
 ]
 ```
 

documentation/en/api-v0-methods.md

@@ -4729,7 +4729,7 @@ Perms: read
 Inputs:
 ```json
 [
-  20
+  21
 ]
 ```
 
@@ -4744,7 +4744,7 @@ Perms: read
 Inputs:
 ```json
 [
-  20
+  21
 ]
 ```
 
@@ -5445,7 +5445,8 @@ Response:
     "UpgradeSharkHeight": 10101,
     "UpgradeHyggeHeight": 10101,
     "UpgradeLightningHeight": 10101,
-    "UpgradeThunderHeight": 10101
+    "UpgradeThunderHeight": 10101,
+    "UpgradeWatermelonHeight": 10101
   }
 }
 ```
@@ -6370,7 +6371,7 @@ Inputs:
 ]
 ```
 
-Response: `20`
+Response: `21`
 
 ### StateReadState
 StateReadState returns the indicated actor's state.

documentation/en/api-v1-unstable-methods.md

@@ -6166,7 +6166,7 @@ Perms: read
 Inputs:
 ```json
 [
-  20
+  21
 ]
 ```
 
@@ -6181,7 +6181,7 @@ Perms: read
 Inputs:
 ```json
 [
-  20
+  21
 ]
 ```
 
@@ -6957,7 +6957,8 @@ Response:
     "UpgradeSharkHeight": 10101,
     "UpgradeHyggeHeight": 10101,
     "UpgradeLightningHeight": 10101,
-    "UpgradeThunderHeight": 10101
+    "UpgradeThunderHeight": 10101,
+    "UpgradeWatermelonHeight": 10101
   }
 }
 ```
@@ -7890,7 +7891,7 @@ Inputs:
 ]
 ```
 
-Response: `20`
+Response: `21`
 
 ### StateReadState
 StateReadState returns the indicated actor's state.