fix(contracts): Reinitialize dependencies to resolve build errors caused by repository migration [SEQ-223] (#26)

* fix(contracts): Remove submodules created in pre-migration repository

* forge install: forge-std

v1.9.3

* forge install: openzeppelin-contracts

v5.1.0

* fix(contracts): Rename `MetaBasedSequencerChain.sol` to be consistent with casing used in the source code

Causes problems on platforms where filenames are case sensitive

* fix(contracts): Remove old `.gitmodules` from contracts subdirectory

The repository root contains `.gitmodules` created by running `forge install`

Author: RomanHodulak

.gitmodules

@@ -0,0 +1,6 @@
+[submodule "metabased-contracts/lib/forge-std"]
+	path = metabased-contracts/lib/forge-std
+	url = https://github.com/foundry-rs/forge-std
+[submodule "metabased-contracts/lib/openzeppelin-contracts"]
+	path = metabased-contracts/lib/openzeppelin-contracts
+	url = https://github.com/OpenZeppelin/openzeppelin-contracts