docs: update x/foundation specification (#721)

* Add README.md into x/foundation

It would eventually replace the spec folder.

* Fill README.md

* Update README.md

* Update CHANGELOG.md

* Update references to the latest commit of main

* Remove old spec

* Update references to the latest commit of chain

Also, correct the line numbers.

* Remove all the legacy spec files

* Update references to the latest commit of main

* Add update-params tx cli

* Update params field name

CHANGELOG.md

@@ -134,3 +134,4 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (docs) [\#483](https://github.com/line/lbm-sdk/pull/483) update documents on x/stakingplus
 * (docs) [\#490](https://github.com/line/lbm-sdk/pull/490) update documents on x/consortium
 * (docs) [\#602](https://github.com/line/lbm-sdk/pull/602) update outdated events in specs
+* (docs) [\#721](https://github.com/line/lbm-sdk/pull/721) update x/foundation specification

x/README.md

@@ -11,7 +11,7 @@ Here are some production-grade modules that can be used in Cosmos SDK applicatio
 - [Authz](authz/spec/README.md) - Authorization for accounts to perform actions on behalf of other accounts.
 - [Bank](bank/spec/README.md) - Token transfer functionalities.
 - [Capability](capability/spec/README.md) - Object capability implementation.
-- [Foundation](foundation/spec/README.md) - foundation related functionalities.
+- [Foundation](foundation/README.md) - foundation related functionalities.
 - [Crisis](crisis/spec/README.md) - Halting the blockchain under certain circumstances (e.g. if an invariant is broken).
 - [Distribution](distribution/spec/README.md) - Fee distribution, and staking token provision distribution.
 - [Evidence](evidence/spec/README.md) - Evidence handling for double signing, misbehaviour, etc.