feat(core): implement core MEV bot functionality with market scanning and Uniswap V3 pricing

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

vendor/github.com/ethereum/go-ethereum/metrics/counter.go

@@ -0,0 +1,55 @@
+package metrics
+
+import (
+	"sync/atomic"
+)
+
+// GetOrRegisterCounter returns an existing Counter or constructs and registers
+// a new Counter.
+func GetOrRegisterCounter(name string, r Registry) *Counter {
+	return getOrRegister(name, NewCounter, r)
+}
+
+// NewCounter constructs a new Counter.
+func NewCounter() *Counter {
+	return new(Counter)
+}
+
+// NewRegisteredCounter constructs and registers a new Counter.
+func NewRegisteredCounter(name string, r Registry) *Counter {
+	c := NewCounter()
+	if r == nil {
+		r = DefaultRegistry
+	}
+	r.Register(name, c)
+	return c
+}
+
+// CounterSnapshot is a read-only copy of a Counter.
+type CounterSnapshot int64
+
+// Count returns the count at the time the snapshot was taken.
+func (c CounterSnapshot) Count() int64 { return int64(c) }
+
+// Counter hold an int64 value that can be incremented and decremented.
+type Counter atomic.Int64
+
+// Clear sets the counter to zero.
+func (c *Counter) Clear() {
+	(*atomic.Int64)(c).Store(0)
+}
+
+// Dec decrements the counter by the given amount.
+func (c *Counter) Dec(i int64) {
+	(*atomic.Int64)(c).Add(-i)
+}
+
+// Inc increments the counter by the given amount.
+func (c *Counter) Inc(i int64) {
+	(*atomic.Int64)(c).Add(i)
+}
+
+// Snapshot returns a read-only copy of the counter.
+func (c *Counter) Snapshot() CounterSnapshot {
+	return CounterSnapshot((*atomic.Int64)(c).Load())
+}