Add LS support for importing mule projects and expose available migration tools

[RadCod3]

Purpose

$subject

• This PR exposes the an API for BI to invoke mule migrations.
• It also exposes an API for BI to know which migration tools are available.

Fixes wso2/product-ballerina-integrator#974
Related: wso2/product-ballerina-integrator#380

[RadCod3]

The project migration test failed due to the generated functions.bal file from the project having different orderings of function definitions.

functions.bal generated in the GitHub action

import ballerina/log;

public function commonConfig1Flow(Context ctx) {
    log:printInfo(\"xxx: common config1 logger invoked\");
}

public function commonConfig2Sub_Flow(Context ctx) {
    log:printInfo(\"xxx: common config2 logger invoked\");
}

public function mainconfigSub_Flow(Context ctx) {
    log:printInfo(\"xxx: main config logger invoked\");
}

function _dwMethod0_(json payload) returns json|error {
    float conversionRate = 13.15;
    return {\"s\": \"Hello World\", \"n\": 1.23, \"b\": true, \"a\": check [1, 2, 3].ensureType(json), \"o\": check {\"name\": \"Anne\"}.ensureType(json)};
}

functions.bal generated locally

import ballerina/log;

function _dwMethod0_(json payload) returns json|error {
    float conversionRate = 13.15;
    return {\"s\": \"Hello World\", \"n\": 1.23, \"b\": true, \"a\": check [1, 2, 3].ensureType(json), \"o\": check {\"name\": \"Anne\"}.ensureType(json)};
}

public function commonConfig2Sub_Flow(Context ctx) {
    log:printInfo(\"xxx: common config2 logger invoked\");
}

public function commonConfig1Flow(Context ctx) {
    log:printInfo(\"xxx: common config1 logger invoked\");
}

public function mainconfigSub_Flow(Context ctx) {
    log:printInfo(\"xxx: main config logger invoked\");
}

Both use the same migrate-mule version and consistently exhibit this ordering difference. Why exactly this happens needs to be investigated further.

Since the single mule file test case is passing, it should be acceptable to remove this test case, as from BI's perspective it doesn't matter whether we are migrating a single
mule file or a mule project.