Add flow transactions profile command

[jribbink]

Closes #2251

Description

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[codecov-commenter]

Codecov Report

❌ Patch coverage is 68.30357% with 71 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/transactions/profile.go	68.46%	47 Missing and 23 partials ⚠️
internal/util/util.go	0.00%	1 Missing ⚠️

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[Copilot]

Pull request overview

This PR adds a new flow cadence profile command that enables profiling of transaction execution on Flow networks. The command generates pprof-compatible profile data for analyzing transaction performance and resource usage.

Changes:

• Implements transaction profiling functionality by replaying transactions using FVM with forked state
• Adds comprehensive test coverage for validation, result formatting, and integration testing with local emulator
• Increases gRPC timeout from 5 to 60 seconds to support profiling operations

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
internal/util/util.go	Increases GetChainIDFromHost timeout to 60 seconds to accommodate profiling operations
internal/transactions/transactions.go	Registers the new profile command with the transaction command group
internal/transactions/profile.go	Core implementation of transaction profiling including FVM setup, state forking, and pprof export
internal/transactions/profile_test.go	Comprehensive test suite covering validation, result formatting, and integration scenarios

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[Copilot]

Calling getFreePort(nil) will panic if an error occurs (line 215), but this is called from createEmulatorServer where no test context is available to fail gracefully. Consider passing a valid test context or handling errors without panicking.

Suggested change

	func createEmulatorServer(port int) *server.EmulatorServer {
	zlog := zerolog.New(zerolog.ConsoleWriter{Out: io.Discard})
	restPort := getFreePort(nil)
	adminPort := getFreePort(nil)
	debuggerPort := getFreePort(nil)
	func mustGetFreePort() int {
	l, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
	panic(fmt.Sprintf("failed to acquire free port: %v", err))
	}
	defer l.Close()
	addr, ok := l.Addr().(*net.TCPAddr)
	if !ok {
	panic(fmt.Sprintf("listener address is not *net.TCPAddr: %T", l.Addr()))
	}
	return addr.Port
	}
	func createEmulatorServer(port int) *server.EmulatorServer {
	zlog := zerolog.New(zerolog.ConsoleWriter{Out: io.Discard})
	restPort := mustGetFreePort()
	adminPort := mustGetFreePort()
	debuggerPort := mustGetFreePort()