Separate compilation and linker phases (#376)

Separate between compilation and linker phases to allow deploy time
linking and back-porting era compiler changes to fix #91. Unlinked
contract binaries (caused by missing libraries or missing factory
dependencies in turn) are emitted as raw ELF object.

Few drive by fixes:
- #98
- A compiler panic on missing libraries definitions.
- Fixes some incosistent type forwarding in JSON output (empty string
vs. null object).
- Remove the unused fallback for size optimization setting.
- Remove the broken `--lvm-ir`  mode.
- CI workflow fixes.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>
Signed-off-by: xermicus <bigcyrill@hotmail.com>
Signed-off-by: xermicus <cyrill@parity.io>

crates/llvm-context/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "revive-llvm-context"
-version = "0.3.0"
+version = "0.4.0"
 license.workspace = true
 edition.workspace = true
 repository.workspace = true
@@ -20,7 +20,6 @@ itertools = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 num = { workspace = true }
 hex = { workspace = true }
-sha3 = { workspace = true }
 inkwell = { workspace = true }
 libc = { workspace = true }
 polkavm-disassembler = { workspace = true }