File locking and DevelopmentService improvements (#358)

- Moved `file::getlock(path)` from `Tactility` to `TactilityCore`
- Changed all existing `file::*` functions to implement locking by default
- Removed all manual locking where `file::*` functions were used
- When `DevelopmentService` receives a file, it doesn't try to allocate it all in memory. This fixes going out-of-memory on devices without PSRAM.
- Fix for TactilityC include

Tactility/Source/file/FileLock.cpp

@@ -5,20 +5,8 @@
 
 namespace tt::file {
 
-class NoLock : public Lock {
-    bool lock(TickType_t timeout) const override { return true; }
-    bool unlock() const override { return true; }
-};
-
-static std::shared_ptr<Lock> noLock = std::make_shared<NoLock>();
-
-std::shared_ptr<Lock> getLock(const std::string& path) {
-    auto sdcard_lock = hal::sdcard::findSdCardLock(path);
-    if (sdcard_lock != nullptr) {
-        return sdcard_lock;
-    } else {
-        return noLock;
-    }
+std::shared_ptr<Lock> _Nullable findLock(const std::string& path) {
+    return hal::sdcard::findSdCardLock(path);
 }
 
 }