Add rebuild patter to reuse instance of class

[l-trotta]

Closes #529, closes #91.
Using the rebuild() pattern inspired by https://github.com/FasterXML/jackson-core to allow taking an instance of a class (excluding responses and abstract classes) and reverting it back to it's builder, keeping the already existing field values.

Usage example:

 SearchRequest searchRequest = SearchRequest.of(s -> s
     .size(20)
     .index("test")
     .query(q -> q.match(m -> m.field("field").query("value")))
 );
 SearchRequest.Builder builder = searchRequest.rebuild();

 SearchRequest searchRequestRebuilt = builder
    // can update values here
   .build();

[github-actions]

The backport to 8.19 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.19 8.19
# Navigate to the new working tree
cd .worktrees/backport-8.19
# Create a new branch
git switch --create backport-1139-to-8.19
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 7e39fa77228d24e07d63ad66dc80e92a736028b0
# Push it to GitHub
git push --set-upstream origin backport-1139-to-8.19
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.19

Then, create a pull request where the base branch is 8.19 and the compare/head branch is backport-1139-to-8.19.

[github-actions]

The backport to 9.1 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-9.1 9.1
# Navigate to the new working tree
cd .worktrees/backport-9.1
# Create a new branch
git switch --create backport-1139-to-9.1
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 7e39fa77228d24e07d63ad66dc80e92a736028b0
# Push it to GitHub
git push --set-upstream origin backport-1139-to-9.1
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-9.1

Then, create a pull request where the base branch is 9.1 and the compare/head branch is backport-1139-to-9.1.

[github-actions]

The backport to 9.2 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-9.2 9.2
# Navigate to the new working tree
cd .worktrees/backport-9.2
# Create a new branch
git switch --create backport-1139-to-9.2
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 7e39fa77228d24e07d63ad66dc80e92a736028b0
# Push it to GitHub
git push --set-upstream origin backport-1139-to-9.2
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-9.2

Then, create a pull request where the base branch is 9.2 and the compare/head branch is backport-1139-to-9.2.

[github-actions]

The backport to 9.3 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-9.3 9.3
# Navigate to the new working tree
cd .worktrees/backport-9.3
# Create a new branch
git switch --create backport-1139-to-9.3
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 7e39fa77228d24e07d63ad66dc80e92a736028b0
# Push it to GitHub
git push --set-upstream origin backport-1139-to-9.3
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-9.3

Then, create a pull request where the base branch is 9.3 and the compare/head branch is backport-1139-to-9.3.

[l-trotta]

skipping backporting in favor of just regenerating the branches with the new generator changes.