Support the object source map returned by vyper 0.4

[Eljees]

Compiling any project with vyper 0.4.x currently crashes:

  File "crytic_compile/platform/vyper.py", line 102, in compile
    ]["sourceMap"].split(";")
AttributeError: 'dict' object has no attribute 'split'

Since 0.4, vyper returns evm.deployedBytecode.sourceMap as an object rather than a string:

breakpoints, error_map, pc_ast_map, pc_ast_map_item_keys,
pc_breakpoints, pc_jump_map, pc_pos_map, pc_pos_map_compressed

I did not find an existing issue for this, so I am opening the PR directly - happy to file one if you prefer to track it.

Fix

The same solc-style map is still there, under pc_pos_map_compressed:

0:152:0:-;-1:-1:-1;-1:-1:-1;...

So the fix is to read that key when the compiler hands back an object, and keep the existing path untouched for 0.3.7, where sourceMap is a string. This restores real source maps rather than only avoiding the crash.

I kept the change to the source map alone. compile() already logs "Vyper != 0.3.7 support is a best effort and might fail", and scripts/ci_test_vyper.sh pins vyper>=0.3.7,<0.4, so I did not want to claim full 0.4 support in this PR. If you would like the CI script extended to a 0.3.7 + 0.4.x matrix, I am glad to do it here or in a follow-up.

Tests

New tests/test_vyper.py. It needs no vyper binary: _run_vyper_standard_json is monkeypatched to return a 0.4-shaped artifact, and the test asserts the resulting srcmaps_runtime.

Before the fix:

E   AttributeError: 'dict' object has no attribute 'split'
crytic_compile/platform/vyper.py:102

After the fix: 1 passed.

Checked end to end against real compilers as well:

• vyper 0.4.3, a contract using an interface, an event, a default argument, natspec and staticcall: 392 source map entries, ABI and AST populated, no crash.
• vyper 0.3.7, tests/vyper/auction.vy from this repository: 1858 entries, unchanged.

Also run: ruff check crytic_compile/ tests/ (clean), ruff format --check (clean), ty check crytic_compile/ (no new diagnostics compared to master).

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