Add starknet_getCompiledCasm

[kirugan]

Here are several class hashes that I used to test this PR:

1. cairo0 (0x5f18f9cdc05da87f04e8e7685bd346fc029f977167d5b1b2b59f69a7dacbfc8)
2. cairo1 (0x0631509cbd3a29d2ab5fe39e26b9fdbb7eac2db19d01ffb9582a444ddc072ba8)

Test script to check cairo0 classes:

func TestMe(t *testing.T) {
	fd, err := os.Open("") // path to list of cairo0 class hashes (each line - class hash)
	require.NoError(t, err)

	sc := bufio.NewScanner(fd)

	var classHashes []*felt.Felt
	for sc.Scan() {
		classHash, err := new(felt.Felt).SetString(sc.Text())
		require.NoError(t, err)

		classHashes = append(classHashes, classHash)
	}
	require.NoError(t, sc.Err())

	db, err := pebble.New("") // path to your db
	require.NoError(t, err)

	chain := blockchain.New(db, &utils.Sepolia)
	st, closer, err := chain.HeadState()
	require.NoError(t, err)
	defer closer()

	for _, classHash := range classHashes {
		declaredClass, err := st.Class(classHash)
		require.NoError(t, err)

		cairo0 := declaredClass.Class.(*core.Cairo0Class)
		_, err = adaptCairo0Class(cairo0)
		if err == nil {
			fmt.Println("Seems good", classHash)
		} else {
			fmt.Println("Seems bad", classHash, err)
		}
	}
}

[codecov]

Codecov Report

Attention: Patch coverage is 55.28455% with 55 lines in your changes missing coverage. Please review.

Project coverage is 75.40%. Comparing base (3093ca8) to head (3ad1501).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rpc/compiled_casm.go	49.01%	46 Missing and 6 partials ⚠️
utils/maps.go	72.72%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2204      +/-   ##
==========================================
- Coverage   75.63%   75.40%   -0.23%     
==========================================
  Files         104      106       +2     
  Lines       11102    11222     +120     
==========================================
+ Hits         8397     8462      +65     
- Misses       2073     2121      +48     
- Partials      632      639       +7     

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[pnowosie]

Great work 👍