fix: trace file template ((#278)

This puts in place a simple fix for the trace file template related to
the ability to customise the class name generated.

src/exporters/besu_trace_columns.java

@@ -51,7 +51,7 @@ static List<ColumnHeader> headers(int length) {
  return headers;
  }
 
- public Trace(List<MappedByteBuffer> buffers) {
+ public {{ class }} (List<MappedByteBuffer> buffers) {
  {{ #each registers }}
  this.{{ java_name }} = buffers.get({{ @index }});
  {{ /each }}
@@ -66,7 +66,7 @@ public int size() {
  }
 
  {{#each columns}}
- public Trace {{ this.appender }}(final {{ this.tupe }} b) {
+ public {{ class }} {{ this.appender }}(final {{ this.tupe }} b) {
  if (filled.get({{ this.reg_id }})) {
  throw new IllegalStateException("{{ this.corset_name }} already set");
  } else {
@@ -79,7 +79,7 @@ public int size() {
  }
 
  {{/each}}
- public Trace validateRow() {
+ public {{ class }} validateRow() {
  {{#each registers}}
  if (!filled.get({{ this.id }})) {
  throw new IllegalStateException("{{ this.corset_name }} has not been filled");
@@ -92,7 +92,7 @@ public Trace validateRow() {
  return this;
  }
 
- public Trace fillAndValidateRow() {
+ public {{ class }} fillAndValidateRow() {
  {{#each registers}}
  if (!filled.get({{ this.id }})) {
  {{ this.java_name }}.position({{ this.java_name }}.position() + {{ this.bytes_width }});