feat:config:force existing users to opt into new defaults (#10488)

* Config default does not comment out EnableSplitstore

* Loadability check

* Remove test used for debugging

* regexp for properly safe check that config is set

* regexp for safely matching the EnableSpitstore field in the config

* Add instructions for undeleting config and remind users to set splitstore false for full archive

* UpdateConfig small docs and functional opts

* make gen

* Lint

* Fix

* nil pointer check on validate

* Unit testing of EnableSplitstore cases

* Address Review

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Co-authored-by: zenground0 <ZenGround0@users.noreply.github.com>

documentation/en/default-lotus-config.toml

@@ -191,7 +191,7 @@
 [Chainstore]
   # type: bool
   # env var: LOTUS_CHAINSTORE_ENABLESPLITSTORE
-  #EnableSplitstore = true
+  EnableSplitstore = true
 
   [Chainstore.Splitstore]
     # ColdStoreType specifies the type of the coldstore.